Blue light apparently suppresses the production ... who keep peeping while they should be sleeping. The benefits of LED lighting are huge, however. From an energy-efficiency standpoint, there ...

LED bulbs are still more expensive than incandescent ... they produce white light. Another method uses a blue LED and yellow or red phosphors. THIS DEFINITION IS FOR PERSONAL USE ONLY.

These are a blue LED with yellow phosphors ... user (LEDs are today around 50 times as expensive as incandescent light bulbs and around seven times the cost of compact fluorescent lamps, based ...