Previously before 10-15 years the majority of electrical lights were either light bulbs (with yellow light) or tube-light sticks (with white light). The major disadvantage of these lighting devices was they consume more electrical energy (in terms of Watt) and gives less luminance (brightness). Light bulb wastes their most of the energy in form of heat. Also the life time of such devices was also short. Next comes compact fluorescent light (CFL) bulbs. They consume much less electrical energy than light bulbs and tube-light sticks and give more light. But their disadvantage is their intensity cannot be varied. Also their life time is limited to few thousand hours. But because their energy consumption is very less compare to light bulbs, they almost replace them.Now a days LED light bulbs are becoming more and more popular because they have several advantages over light bulbs and CFL bulbs. Some of their advantages are listed below