Current LED bulbs with energy efficient lighting at a level up to 120 lumen/Watt. Higher than electric coil that is effectively level 3 lumen/Watt. Cent polyester bulbs. Which is effective up to 80 – 100 lumen/Watt. However, the light bulb will be diffused every cent polyester direction. Make a saengkrachai by waste a lot. While the light of the lamp LED is shining spot in the front only. Therefore, the efficiency of LED bulbs with the more efficient fluorescent lamps.