Philips launched a new LED light bulb and it promises to last 20 years, which is more than 25000 hours. It is a green product and it is commercially launched in stores on Earth Day. Thomas Edison’s luminous light bulb has been on the market for more than 100 years. However, it was a good quality bulb but was notorious for low energy efficiency. The reason behind this was, about 1/10 of the electrical energy that put into the bulb is actually converted into light and the rest ends up as heat- waste.