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MAEER’S

MIT INSTITUTE OF DESIGN 

Graduation Project 2011

LED Luminaires Task Lighting for Hotel Bedrooms Sponsor

Renata Lighting Pvt Ltd Student

Anikesh Prakash Industrial Design (Product Design)

Industry Guide

Faculty Guide

Mr. Anand Kshatriya Prof. Sanjay Jain


The Graduation Project Evaluation Jury recommends Anikesh Prakash  

to be awarded the Graduation Degree of MIT Institute of Design, Pune IN INDUSTRIAL DESIGN (PRODUCT DESIGN) herewith, for the project titled “LED Luminaires – Task Lighting for Hotel Bedroom” MEMBERS: NAME

ORGANIZATION

MAEER’S

MIT INSTITUTE OF DESIGN

On fulfilling the further requirements by*      (*Subsequent remarks regarding fulfilling the requirements:)

GRADUATION PROJCET 2011 PROGRAMME: PG PROGRAMME

Chairperson of the jury

SIGNATURE


Acknowledgement |

I would like to express my gratitude to all those who provided me the possibility to complete this project. I want to sincerely thank Renata Lighting Pvt Ltd for giving me the opportunity to work with them as a team member. I would like to specially thank Mr Rohit Thawani, Mr Anand Kshatriya and Mr Girish Nerkar for always being there for me as my guide & friend throughout my learning and giving their valuable feedback. I am deeply obliged by the support and encouragement which I got from Faculty guide Prof Sanjay Jain. A very sincere thank you to Dean Prof.Anant Chakradeo, Prof. Dhimant Panchal, Prof Arvind Merchant and all the faculties of M.I.T.I.D for supporting me and shaping my design career. Thank you Mr Heeresh Khatri for helping me get this project. Last but not the least; I would like to extend my gratitude to my family, friends, and batch mates for always supporting me and being by my side.

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Content | About Renata……………………………………………………………….........................................................................1 Current product portfolio………………………………………………………………………………………………………..2 Clients Design Brief……………………………………………………………………………………………………………..6 Information collection……………………………………………………………………………………………………………7 Revised Client Brief…………………………………………………………………………………………………………......21 Information collection……………………………………………………………………………………………………………22 Understanding the existing product……………………………………………………………………………………………23 Photometric Data Analysis……………………………………………………………………………………………………..28 Synthesis………………………………………………………………………………………………………………………….64 Conceptualization………………………………………………………………………………………………………………..65 Final concept……………………………………………………………………………………………………………………..67

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About Renata | Renata Lighting Pvt. Ltd is a sister concern Renata Precision Components. It was started by Mr Rohit Thawani in 2009. The company is in the manufacturing of LED based lamps that are made in the Bhosari plant of the company. The core competency of the company is its capability of manufacturing quality components for its lighting products. This is developed over the years by having a client base of many reputed companies for its precision components business. The plant is ISO/TS16949 certified for the quality of its manufacturing. Renata’s Lighting products are made using Philips Luxeon technology which is a proven benchmark for the quality of its lighting. The current product portfolio includes:      

Table lamp Table lamp with cap sense Floor lamp Bedside lamp with C-clamp Ceiling lamp Portrait lamp

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About Renata | All these lamps incorporate the Lumileds technology from Philips and are known for their quality. The LED comes with a life of about 50,000 hours and the company gives one year free replacement warranty to ensure maximum customer satisfaction. Renata Precision does the manufacturing and assembling of lamps whereas Renata Lighting takes care of its designing and marketing.

Product Specification Table lamp: 100 lumens/watt 220 AC/50Hz/2.3W Height: 270mm Width: 120mm

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About Renata | Floor lamp: 100 lumens/watt 220 AC/50Hz/2.3W Height: 1300mm Width: 150mm

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About Renata | Ceiling Lamp: 100 lumens/watt 220 AC/50Hz/2.3W Height: 1250 or 1500mm Width: 120mm

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About Renata | Bedside Lamp: 100 lumens/watt 220 AC/50Hz/2.3W Height: 172mm Width: 65mm

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Clients Brief | “Design a collection of lighting for hotel bedrooms” Summary: Lighting decides mood of the surroundings, makes the guest feel more comfortable and natural. Apart from cleanliness and good service, the atmosphere of a hotel room leaves a lasting impression on the guest. Every hotel has a different type of lighting which creates a particular feel. In a bedroom there are different areas which need different lighting. So there is a need for a good lighting solution to cater the hospitality industry.

Expected at the end of the project: A set of luminaire which has derived from     

User needs and market analysis Photometric data CAD model Rendering Prototype Renata lighting Pvt Ltd | 61


Information and data collection | Interpretation of clients brief          

There were two key words in the clients brief: a) Collection of lighting b) Hotel bedrooms Initial phase of the research began with gathering as much of information that I can of the above mentioned words.

 

       

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Information and data collection | What is lighting? Lighting is the deliberate application of light to achieve some aesthetic or practical effect. Lighting can be mainly categorized into two groups:  Natural Lighting o Light from a natural source viz sun

 Artificial Lighting o Any light that doesn’t come from a natural source Eg: cfl, incandescent lamp, halogen etc

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Information and data collection | Artificial Lighting Main components of artificial lighting are:  Lamp It is a component which produces light source E.g.: o Incandescent bulb o Cfl o LED etc 

Driving elements These are components which are required to operate a light source

1.Lamp

E.g.:

Now,

o Ballast o Switch o Driver etc Lamp + Driving element = Luminaire

“A luminaire is a complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light” Lamp is a part of a Luminaire

2.Driving Element

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Information and data collection | Artificial Lighting ` A luminaire can be further classified into two categories:  Free standing o Luminaires which are not permanently mounted. Eg: Luminaire for table/desk, luminaire for floor etc

 Lighting fixtures o Luminaires that are permanently mounted to a wall/ceiling etc Eg: Recessed lighting, surface mounted lighting etc

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Information and data collection |Hotel Bedroom The basic layout of a hotel room is:

 

tv passage

 

working  area

 

   

bed

wardrobe

seating  area

sleeping area toilet

The main areas of concentration are:  Sleeping area  Working area  Seating area Hence the first phase of field research began with visiting various hotels and checking out the various artificial lighting used in the above mentioned area.

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Information and data collection |Checklist For Luminaire following checklist was made: 1. The type of lamp 2. The shape of the lamp 3. The lamp's diameter 4. The length of the lamp 5. The finish of the lamp 6. The life expectancy of the lamp

For Hotel following checklist was made:  1. Categorize hotels by a. Its location i. City ii. Near airport, railway station etc b. Meet with hotel maintenance people and interviewing them

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Information and data collection |Conclusion Sleeping area: It was observed that majority of the artificial lighting used in sleeping area was either kept on the bed side table or extrudes from the beds headboard or wall.

Those luminaires which were kept on the bed side tables were of a free standing type. The advantage of such kind of luminaire was ease in installation; one has to just plug it in and use, whereas luminaires which were mounted on the wall required some initial investments for setup. However these luminaires are space saving luminaires as they save lots of space on the bedside table.

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Information and data collection |Conclusion

In certain hotels there were pendant type fixtures and down lighters in the sleeping area.

These luminaires can be termed as diffuse luminaires as it distributes light uniformly in all direction. They have dual purpose a) General illumination b) Task Lighting

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Information and data collection |Conclusion Seating area: In this area mostly floor luminaires were used. They serve the purpose of light reading.

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Information and data collection |Conclusion Working area: These are task lighting which ensures a relaxing and enjoyable work session.

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Information and data collection |Conclusion Following are the observations made during the research: • Majority of Lamps brought from the following manufacturers o Phillips o Osram o Surya;

There is a Favorability to use energy efficient lamps

 Mostly Incandescent type of bulb and PL – Cfl of Bayonet cap is used  All the lamps in the luminaires are Operated in 11, 13, 18, 25 Watts  To give a feel of diffused light a finish of frosted and milky white Frosted and milky white finish of the lamp used  Shades come in every form, shape, size and style imaginable and are made of myriad materials viz glass, plastic, linen etc  Switches are usually attached to the base of the lamp whereas dimmers where free standing ones. In some lamps the dimmer itself act as a switch  There was a need for a proper management of wires  For general illumination down lighters and coves were used

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Information and data collection |Conclusion Following are the compilation of Hotel Maintenance people and frequent hotel visitors:  The final luminaire should be an Easy installations: not much modifications in existing structure  It should have Minimum maintenance: the lamps should have a long life than the existing one  Guaranteed products: good quality, standard product Term guarantee  Good Lighting quality (it plays a key role in shaping the image of the hotel and the basic lighting qualities are luminous flux, luminous intensity, luminance and illuminance)  Economy  Reliability  Construction quality  Aesthetic-quality &  Photometric quality  It is particular important in a hotel room or suite to ensure that the lighting is planned with the interior design and the furnishing of the room in mind. This is because the Illuminance required depends on the reflectance of the surface of walls, ceiling, floor and furniture

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Information and data collection |Conclusion  Any form of glare interferes with our sense of wellbeing. So, direct glare due to excessively bright lamps or luminaires and indirect glare caused by reflections should at least be avoided along principal lines of vision  Shades of translucent material allows more light into a room, which makes it seems brighter, darker shades can glow softly when the light is turned on  Lighting design for the hotel rooms should be geared primarily to the need for ambience and comfort, which in lighting terms means luminaires which are individually switched and regulated to cater for different room uses  The light color of the lamp is one of the crucial factors defining the visual ambience of a room  Hotel rooms have a wide variety of function zones (for working, reading, watching tv, resting, sleeping etc). The lighting thus also needs to be multifunctional  Guests need to be able to identify swiftly the various ways in which they can switch and regulate the lighting in the room  The different physical properties of the light sources, their specific beam characteristics, heating properties and light colors even their impact on the interiors and objects illuminated need to be assessed and considered  Lighting creates an atmosphere only in interaction with illuminated room surfaces, objects and shapes, structures, texture and colors 

The color rendering index should be 100

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Information and data collection |Conclusion  Making effective use of lighting means also working with shadow  Apart from the bedside lamps, there is a need for an additional luminaire for performing tasks  Shape and substance of the shade determine the quality and quantity of light the lamp emits  Adjustability: yes and Flicker: no  Brightness control  Glare: low, search for anti-glare baffle  Balance between aesthetics and function  Better wire management  Variation in switching position in the design

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Clients Brief | 2

“Design a collection of LED Task lighting for hotel bedrooms�

Summary: After giving the presentation, above brief was framed. The earlier series of Renata lighting was LED based task lighting and the company wanted to be in manufacturing only LED based Luminaires which is meant for Task lighting. So my new brief was to design a new series of LED task lighting dedicated for hotel industries which fulfills both their aesthetic and the photometric needs.

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Information and data collection |Categorization of Lighting based on Activities Task Lighting: It is lighting which is focused on a specific area to make the completion of visual tasks easier. It is differentiated from area and mood lighting, which are designed simply to illuminate various regions of a space, sometimes creating specific desired effects. Task lighting also eases eye strain when it is installed with care, which can make the work environment more pleasant.

    Task lighting 

Other categories are: Ambient Lighting: It is also known as general or background lighting. It is a direct substitute for natural light. It is commonly supplied by fixtures that diffuse light over surfaces such as walls and ceilings or that glow omnidirectional.

Ambient Lighting 

Accent Lighting: It is a low-level, focused light targeted at Informat‐ ion  Lighting 

decorative features of the interior—a collection of glass, a piece of sculpture, a painting, architectural detail.

Information Lighting: It provides on the spot light to enable us to negotiate our way safely or pick out critical sign post. Accent Lighting 

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Training Period | A short training period was organized to understand the backbone elements of a LED Luminaires. A brief knowledge was given about the type of LED Luminaire Renata Lighting was into. A detailed explanation of each and every element of Illumina Series was given, which was later going to be the backbone of the Luminaire that I was going to design. Following are the elements of an Illumina Luminaire:  LED  MC-PCB  Thermal tape  Heat sink  LED Driver  AC/DC Convertor

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Training Period | Backbone Element LED: Light Emitting Diode is a solid-state semiconductor device, which can convert electricity directly into to light. LED's heart is a semiconductor chip, one side of the chip is attached to a stent, the end is negative, the other side connects to the positive terminal of the power, and the whole chip is packaged by epoxy resin. The area where the electrons recombine with the holes, energy is emitted by the form of photon, which is the principle of LED. The wavelength of the light or the color is determined by the material of PN junction.

Philips Luxeon Power LED

LED chip classification: By Usage: Mainly divided into high-power LED chip and low-power LED chip. By Color: Mainly divided into three types: red, green, blue (raw materials for producing white light). By Shape: Generally divided into square pieces and wafer. By Size: Low-power chips are generally divided into 8mil, 9mil, 12mil, 14mil, etc (1mil = one thousandth of an inch)

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Training Period | Backbone Element Metal Core Printed Circuit Board: These are designed to transmit heat away from operating areas or components on the printed circuit board to less critical areas such as metal heat sink. In order to maintain a low junction temperature to keep good performance of an LED, every method of releasing heat from LEDs should be considered. Conduction, convection, and radiation are the three means of heat transfer. Typically, LEDs are encapsulated in a transparent resin, which is a poor thermal conductor. Nearly all heat produced is conducted through the back side of the chip. Heat is generated from the PN junction by electrical energy that was not converted to useful light, and conducted to outside ambience through a long and extensive path, from junction to solder point, solder point to board, and board to the heat sink and then to the atmosphere. Power LEDs will be mounted on metal-core printed circuit boards (MCPCB), which will be attached to a heat sink. Heat flows from the LED junction through the MCPCB to the heat sink by way of conduction, and the heat sink diffuses heat to the ambient surroundings by convection.

MCPCB

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Training Period | Backbone Element Thermal Tape: It is one type of adhesive that can be used between a Led and heat sink, typically chosen when the heat sink does not have a retention system to stay in place. Thermal tape acts as a coupler to hold the heat sink while it fills small gaps between the two surfaces to more efficiently transfer heat away from the chip. Thermal Tape 

Heat Sink: A heat sink is a term for a component or assembly that transfers heat generated within a solid material to a fluid medium, such as air or a liquid. A heat sink is physically designed to increase the surface area in contact with the cooling fluid surrounding it, such as the air. Approach air velocity, choice of material, fin (or other protrusion) design and surface treatment are some of the design factors which influence the thermal resistance, i.e. thermal performance, of a heat sink. The most common heat sink material is aluminum. Chemically pure aluminum is not used in the manufacture of heat sinks, but rather aluminum alloys.

Heat sink 

The best design has the finned shape (like a radiator) as it allows for the biggest surface to dissipate heat.

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Training Period | Backbone Element Led Driver: An LED driver is a self-contained power supply that has outputs matched to the electrical characteristics of the LED.

AC/DC Converter: LED’s require DC input voltage. Hence we need a convertor which converts alternating current (AC), which periodically reverses direction, to direct current (DC), which is in only one direction.

Led Driver

AC/DC Convertor

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Anthropometry Data | 8.5” 6.9” 8.1” 39”

6.9”

30.5”

th

Considering 99th Percentile for men, as it is the maximum height and 1st percentile for women as it is the smallest height.

Men 99 percentile st

Women 1 percentile

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Lumen Calculation | Floor Luminaire Calculating the Height of the luminaire: The vertical distance from the foot rest surface to the sitting surface for a upholstered chair 1’5” i.e 17”

Sitting height: 30.5” to 39”

Therefore, height of the adjustable floor luminaire should be 30.5” + 17” = 47.5” to 39” + 17” = 56”

Approx min 4’ to max 5’

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Lumen Calculation | Floor Luminaire Measurement of Range:

46.1

29.4

 

 

max

 

9.6

7.9

6

12

  

 

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Lumen Calculation | Floor Luminaire Measurement of Beam Spread:

 

12”

 

 

 

34”

12”

Approx 1.5 meter of Beam spread is required. For Casual reading at least 300 lux is required, hence at the centre of the beam spread there should be 600 lux.  

Illuminance (lux) 600

Distance Spread (meter) 1.2

Beam spread (degree) 1.5

View angle (degree) 64

Flux (Lumen) 825

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Lumen Calculation | Bedside Luminaire Measurement of Range:

19” 18”

 

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Lumen Calculation | Bedside Luminaire Measurement of Range: 13.78”

8.5”

5”

Reading distance

 

 

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Lumen Calculation | Bedside Luminaire Measurement of Range:

 

Pillow  

46” 27.28” Side table

 

 

37”

38”

12”

Approx 1.2 meter of Beam Spread is required

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Lumen Calculation | Bedside Luminaire For Casual reading at least 300 lux is required, hence at the center of the beam spread there should be 600 lux. Illuminance (lux) 600

 

Distance Spread (meter) 1.2

Beam spread (degree) 1.5

View angle (degree) 54

Flux (Lumen) 592

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Lumen Calculation | Working Area Luminaire Measurement of Range

 

 

max height

Table surface  

 

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Lumen Calculation | Working Area Luminaire Measurement of Beam Spread:

12”

20”

12”

 

Approx 1.2 meter of Beam Spread is required

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Lumen Calculation | Working Area Luminaire For Tasks involving writing 1000 lux is required.  

Illuminance (lux) 1000

 

Distance Spread (meter) 0.48

Beam spread (degree) 1.12

View Angle (degree) 50

Flux (Lumen) 136

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Lumen Calculation | Working Area Luminaire Measurement of Range:

Standard height of the ceiling = 120” Reading plane = 36” Therefore distance between reading plane and ceiling height = 84” length of the luminaire = 24” Now, Distance between led engine and reading plane = 60”

   

 

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Lumen Calculation | Working Area Luminaire For casual reading at least 300 lux is required, hence at the center of the Beam Spread there should be 600 lux. Illuminance (lux) 1000

 

Distance Spread (meter) 1.5

Beam spread (degree) 1.5

View Angle (degree) 53

Flux (Lumen) 1485

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Light engine configuration | We want a desired illuminanation of a particular length, which on a plane at a certain distance from the light source Following are the factors on which Illuminance is dependent upon: •

Vertical Distance from Source

Radial distance from Source

LED output : 100 lumens/watt; 130 lumens/watt

Driving Current : 350mA; 500mA; 700mA

Number of LEDs : 1;2;3

Secondary Optics : Reflector; Lens

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Light engine configuration | Illuminance – Vertical Distance from Source: 1 x 100lm/watt at 700 mA at Ce ntre (Ze ro Degree ) : Lux lev el at Varying Distance 900

800

816

700

600

Lux

500

400

300 266 200 129 100

97 63

48

32

29

0 300

500

700

800

1000

1200

1300

1500

Distance

• Significant fall in Illuminance with distance from & Source Loss of Illuminance is not linear

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Light engine configuration | • Illuminance – Radial Distance from Source:

1x130lm/watt at 700mA: Spread 300

500 mm 266

253

250

1000 mm

253

223

223

Lux

200 179

179

150 130

130

100 50

34

44

54

63

60

60

54

44

34

0 -400

-300

-200

-100

0

100

200

300

400

Spread (mm)  Significant fall in Illuminance with radial distance from Source & Loss of Illuminance is approximately 50% at 400 mm radial distance

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Light engine configuration | Illuminance – LED output:

Lux level based on LED output at 700mA at 500mm from Source 300 100lm/watt

250

244 232

Lux

200

217 204

130lm/watt

184 171

150

142 130 103 91

100 50

74 63

0 0

100

200

300

400

500

Spread (mm)

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Light engine configuration | Illuminance – LED output:

Lux level based on LED output at 700mA at 1000mm from Source 60 100lm/watt

50

49 45

Lux

40

46 43

42 38

130lm/watt

35 32

30

27 24

20

22 20

10 0 0

100

200

300

400

500

Spread (mm) • A 30% increase in LED Output translates only to a 5-10% increase in Lux level at 500-1000 mm

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Light engine configuration | Illuminance – Driving Current : 1 x100 lm/watt

Lux

1 x 100lm/watt at : Lux level at Varying Distance and Varying Current 900 800 700 600 500 400 300 200 100 0

816 800

350mA

500mA

700mA

404 266 210 130 300

500

129 128 64 700

97 96 49 800

63 56 33 1000

48 46 22 1200

32 39 19 1300

29 30 15 1500

Distance from Source (mm)

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Light engine configuration | Illuminance – Driving Current; 3x130 lm/watt

Lux

3 x 130lm/watt LEDs : Lux Level at Increasing Distance 2700 2550 2400 2250 2100 1950 1800 1650 1500 1350 1200 1050 900 750 600 450 300 150 0

2490 2360

350mA

500mA

700mA

1277 790 762 405 300

500

420 370 206 700

295 271 152 800

201 210 98 1000

133 138 59 1200

103 108 47 1300

75 78 38 1500

Distance from Source (mm)

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Light engine configuration | Illuminance – Impact of Driving Current at 500mm

1x130lm/watt at 500 mm : Increase in Illuminance with Current 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

350mA to 500mA

500mA to 700mA

62% 51% 43%

0

100

89%

89%

91%

15%

14%

15%

56% 46%

200

300

400

500

Spread (mm)

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Light engine configuration | Illuminance – Impact of Driving Current at 500mm

3x130lm/watt at 500 mm : Increase in Illuminance with Current 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0%

350mA to 500mA

88%

500mA to 700mA

79% 72% 60% 48% 42% 35%

49% 38%

23% 14% 7% 0

100

200

300

400

500

Spread (mm)

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Light engine configuration | Illuminance – Impact of Driving Current at 1000mm

1x130lm/watt at 1000 mm : Increase in Illuminance with Current 120% 350mA to 500mA

500mA to 700mA

100% 90%

100%

96%

106%

100%

80% 70% 60% 40% 21%

20%

3%

0% 0

100

4% 200

0% 300

6% 400

8% 500

Spread (mm)

Renata lighting Pvt Ltd | 50 1


Light engine configuration | Illuminance – Impact of Driving Current at 1000mm

3x130lm/watt at 1000 mm : Increase in Illuminance with Current 140% 350mA to 500mA 120%

500mA to 700mA 117%

105%

100%

100%

99%

84%

80%

74%

60% 40% 20% 9%

0% 0

18%

14% 5% 100

26%

1% 200

300

400

500

Spread (mm)

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Light engine configuration | Illuminance – Driving Current • Increasing Current from 350mA to 500mA almost doubles the light output •

Increasing from 500mA to 700mA gives only a 5-10% increase

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Light engine configuration | Illuminance – Number of LEDs at 500 mm from Source

Increase in Illuminance with increase from 1 to 3 x 130lm/watt LEDs at 500 mm from Source 400% 300% 200% 350mA

100%

500mA

700mA

0% 0

100

200

300

400

500

Spread (mm)

Renata lighting Pvt Ltd | 53 1


Light engine configuration | Illuminance – Number of LEDs at 1000 mm from Source

Increase in Illuminance with increase from 1 to 3 x 130lm/watt LEDs at 1000 mm from Source 400% 300% 200% 100%

350mA

500mA

0

100

700mA

0% 200

300

400

500

Spread (mm)

Renata lighting Pvt Ltd | 54 1


Light engine configuration | Illuminance – Number of LEDs • Increasing the number of LEDs increases Light output •

Increase follows a Linear relationship viz 3 LEDs give 300% more Illuminance compared to 1 LED.

This relationship holds over distance from Source

This relationship holds over Spread

Renata lighting Pvt Ltd | 55 1


Light engine configuration | Illuminance – Use of Lenses Illuminance various Lenses: 1x130lm/watt at 700mA at 500 mm from Source

No lens

3000

100 deg

80 deg

40 deg

25 deg

xx deg

2500 2000 1500 1000 500 0 -400

-300

-200

-100

0

100

200

300

400

Spread (mm)

Renata lighting Pvt Ltd | 56 1


Light engine configuration | Illuminance – Use of Lenses Illuminance various Lenses: 1x130lm/watt at 700mA at 500 mm from Source

No lens

1800

100 deg

40 deg

25 deg

1600 1400 1200 1000 800 600 400 200 0 -400

-300

-200

-100

0

100

200

300

400

Spread (mm)

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Light engine configuration | Illuminance – Use of Lenses • Narrow Beam Lenses concentrate the light output over a narrow spread •

Lux levels are more uniform with wide angle lenses

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Light engine configuration | Illuminance – Results for Table Lamp (500 mm from Source) Spread (mm)

-400

-300

-200

-100

0

100

200

300

400

Target

200

300

400

500

600

500

400

300

200

1 LED No Lens

130

179

223

253

266

253

223

179

130

1 LED with Reflector & Diffuser

145

197

236

257

261

257

236

197

145

3 LED No Lens

390

526

653

740

790

740

653

526

390

1 LED 80 Deg Lens

39

90

240

680

1135

680

240

90

39

1 LED 100 Deg Lens

328

423

538

646

866

646

538

423

328

Renata lighting Pvt Ltd | 59 1


Light engine configuration | Illuminance – Table Lamp

Table Lamp : 130lm/watt at 700mA at 500 mm from Source

1200 1135 1000 866 790

800 653

600 400

390 328

200

-400

538

423

400

300

200 145 130 39

0

526

197 179 90 -300

240 236 223

-200

740 680 646

600

500

500

266 261

257 253

-100

740 680 646

0

257 253

100

653 538

526

400

423

390 328

300 240 236 223

200

200 145 130 39

197 179 90 300

400

Target

1 LED No Lens

1 LED with Reflector & Diffuser

3 LED No Lens

1 LED 80 Deg Lens

1 LED 100 Deg Lens

Renata lighting Pvt Ltd | 60 1


Light engine configuration | Illuminance – Conclusions for Table Lamp •

1 LED driven at 700mA gives insufficient Illuminance

3 LEDs driven at 700mA give Illuminance as per target

1 LED driven at 700mA and with narrow beam lens gives very high Illuminance in the centre but poor spread

1 LED driven at 700mA and with 100 degree lens gives Illuminance as per target

130 lumen/watt LED does not give significant improvement compared to 100 lumen/watt

Dropping the current to 500 mA will not affect Illuminance significantly

Conclusion : 1x 100lm/watt LED driven at 500mA with 100 degree Lens

Renata lighting Pvt Ltd | 61 1


Light engine configuration | Illuminance – Bedside Lamp

Bedside Lamp: 130lm/watt at 700 mA at 1000 mm from Source 800 700 600 500 400

549 366

300 200 100 0

200 134 36 11 -400

594

396

633

426 422 400

300 230 135 47 -300

600 530 472

500 502 448

168

193

56

61

-200

708

672

-100

210 62 0

672 500 502 448

193 61 100

633

594

426 422 400

396 300 230

168 56 200

549 366

135

200 134 111

47

36

300

Target

1 LED with Reflector & Diffuser

3 LED No Lens

2 LED 40 Deg Lens

2 LED 100 Deg Lens

3 LED 100 Deg Lens

400

Renata lighting Pvt Ltd | 62 1


Light engine configuration | Lamp Specifications to achieve specified Illuminance 3

2 Bedside Lamp

1 Table Lamp

LEDs

No lens

60 Deg

100 Deg

Lens

Current : 500 mA ; LED : 100 lumen/watt

Renata lighting Pvt Ltd | 63 1


Conceptualization | It has now reached the stage where the photometric requirement is achieved. Now it’s the aesthetic that needs to be designed to complement the photometry. Renata Lighting gave me an opportunity to visit “Light India International 2011� which was held in Chennai. During the exhibition I got to interact with the actual users. Following are the set of synthesis: a) Bright light output b) Dimmer facility c) Need Battery Backup d) Form should be that of the luminaires that are available. No radical design

Keeping this in mind I started the conceptualization phase. The goal was to develop a luminaire for bedside, for seating area and for working area. For the bedside there are two possibilities, one can either have a wall mounted one or a free standing one, whereas for the remaining two area one only needs a free standing one. There was one constrain from the manufacturing part: Min no. of parts.

Renata lighting Pvt Ltd |64 1


Conceptualization | shade    

Plain metallic sheet 

Shades with  combination of metal  and glass, where the  glass end is closed 

Shades with combination  of metal and glass. The  glass part has metallic  srtips 

Shades with combination  of metal and glass 

Renata lighting Pvt Ltd | 65 1


Conceptualization | Base Some features were added to the bases  

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Conceptualization | Final    

Luminaire for table/desk

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Conceptualization | Final    

 

Renata lighting Pvt Ltd |68 1


Conceptualization | Final                

 

Bedside wall mounted Fixture    

Renata lighting Pvt Ltd |69 1


Conceptualization | Final A Floor luminaire for the seating area

Renata lighting Pvt Ltd |70 1


Diploma Project Documentation