LEDs are finally inexpensive at just US$3 and burn for 100,000 hours
One of the critical factor that was not letting LED light bulbs enter main stream market was its price. Its not very expensive but certainly not any cheaper than the ordinary bulbs. Cambridge University researchers have developed a very cheap LED bulb that consumes less energy and can last up to 60 years. These LEDs are gallium nitride based bulbs that are more energy efficient than incandescent and compact fluorescent bulbs as well. The GaN (Gallium Nitride) is grown on
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