Cambridge University’s researchers will producing LED bulb which offer eco-friendly lighting function. The researchers said that the LED bulb not consist of mercury, cause it made from silicon water, not from sapphire like the recent bulb., so it also cheap They also state that this bulb can last up to 100,000 hours or about 60 years. Beside that, it able to reduce carbon emission up to 40 million tons. No words when the LED bulb will be available, but if you want to buy it, you have to save your money for about $2.85.