1) Approximately 20% of electricity generated in India is consumed by lighting.
2) The most common means of lighting is the incandescent bulbs/tubes.
3) These bulbs are very inefficient, as energy consumed by them produce heat and not light.
4) Though halogen lamps produce brighter and white light, but they generate excessive heat and could be fire hazard.
5) Of late, another source of lighting which is gaining popularity is LED (Light Emitting Diodes).
6) LEDs are limited to single bulb use in applications such as instrument panels, electronics, penlights,  flashlights, etc.
7) LEDs offer only focused light and are best use for reading light, spotlights, signage lighting etc.
Over the years compact fluorescent lights have been introduced which are found to be more energy efficient.
9) CFLs last 8-10 times longer than the ordinary bulbs.
10)CFLs fill the rooms with the same amount of light using less energy than a standard bulb.
11)Although cost of the CFL is higher than an ordinary bulb or tube, but the cost of saving  over the bulb is  striking
12) CFLs do not use heat to produce light and are much more efficient as compared to a regular bulb.
13) Every incandescent lamp replaced by a CFL helps to fight global warming.
14) It is estimated that replacing a single bulb with a CFL will keep half-ton of  carbon dioxide out of the  atmosphere over its lifetime.  

Researched by Maninder