Light Bulbs
There are many different types of light bulbs, each with varying levels of performance and energy efficiency.
Incandescent – These traditional light bulbs are not as energy efficient as newer types of bulbs.
Fluorescent – This includes compact fluorescent light bulbs (CFLs) and tubes which contain mercury.
LED – LEDs are long-lasting and energy efficient with a life span 15 to 20 times longer than incandescent light bulbs.
Halogen – These are a variation of incandescent light bulbs.
Fluorescent Light Bulbs 
LED Light Bulbs 
Halogen Light Bulbs