Along with the mature of the LED light technology, the cost is gradually falling. LED light is widely applied in indoor and outdoor. The penetration has improved quickly these years.
Two years ago, 1W LED chip was about US$3, but it fall to US$1 now. Some LED is cheaper from China. It is reported that LED chip pirce influences the LED light price. I think the LED light will take place of energy saving lamps. Only if the price can be accepted.
There is another LED light technology. When you turn on a LED light, the indoor computer can be connected with the internet at once. There is no wriless router. The TV, water heater, air conditioning can also be automatically controlled.
The LED light wireless optical commuication speed is faster than the wireless communication. So the optical communicaion technology will be widely applied for the network in the future. We can enjoy surfing the internet with faster speed.