Lighting Design Proposal for Major Design Peoject Horton Chapel

Stage 1 - Preparation & Briefing

1.3 Daylight and Sunlight Analysis

1.3.3 Suggetion on Architectural Design

- Selection of building materials

Previous simulations proved that the daylight factor inside the building is not uniform, indicating that the daylight cannot uniformly illuminate the surfaces while going deeper. This advises to apply painting with high reflectance and diffusion on the roof, wall painting with higher relfectance (above 80%), and light-colored floors.

Also in the simulation, 0.65 was usedas the transparency of window, and at the same time it was multiplied by 0.7 as the rate of the frame area to opening area. Therefore, if glass with higher transparency is used in the real project, it will be able to improve the utilization of daylight comparing with the simulation results and save energy consumption.

- Sun tunnels as substitudes of roof windows https://www.velux. co.uk/products/suntunnels#daylight

Existing design imports skylight by chiseling the roof, but from the figure below it can be seen that daylight factor provided by the roof windows work only for small range of indoor space, but with potential glare.

Therefore, it is recommended to use daylight tunnels instead of skylights, which could give a better spread of light throughout the room. Because the daylight tunnel has a milder intervention on the building structure, more of them could be used at the same time to make full use of skylight.

- Reducing the height of seat stacks

Original arrangement of seat stacks

After reducing the height with 0.7 meter

As can be seen from the figure below, by moving the space for storing folding chairs by 0.7 meters, the daylight utilization of the interior space can be improved.

From left to right:

Daylight factor provided by roof window only

Daylight factor of present design

Daylight factor with 1.6m (reducing 0.7 meter height) seat stacks

Seat stacks

Combination of diffusing material with high reflectance (85%) and arches in Qingfen Canteen, Tsinghua University, China https://mp.weixin.qq.com/s/ly8Qe13KqkH11brvIKzjrw

Original roof window position and possible layout of installation of sun tunnels based on the given technical drawings

Lighting Design Proposal for Major Design Peoject Horton Chapel

Stage 2 - Concept Design

2.1 Overall Design Concept

2.1.1 Design Target

- Desige Concept

Users surrounding residence; visitors; working staff etc.

Inviting people into the chapel; Creating memory highlights; Exhibition; performance; courses; enjoy and relax in bar & cafe, normal works (daytime/night time)

- Space Managing Types and Overall Control Strategy

Guiding concept

Create a sense of the historical imprint and a modern refreshing atmosphere at the same time

Environmental & Sustainability

Protect the bats

Lighting Efficiency Utilization of natural daylight &sunlight

Maintenance friendly

Architecure

Enhance the moldings and decorations which representing the area; Strengthen the feeling of space; Standing the chapel out of surroundings

Perservation on Grade II buildings

- Reference Codes & standards

SLL (2012) Code for Lighting

SLL (2018) Lighting Handbook

SLL LG6 (2016) The exterior environment

SLL LG8 (2015) Lighting for museums and art galleries

SLL LG13 (2019) lighting for place with worship

The lighting control method depends on the manageming types of the space. In this building, facade lighting, most of the ambient light and vertical accent light will be unified on/off controlled by the central control system. The focused and display light will be controlled by the temporary manager of the space (curator, furniture layouter). The task and feature light are jointly controlled by visitors and workers.