Another way you can go green in your office is as easy as changing a light bulb. In fact, it is changing a light bulb. Incandescent bulbs use 4 times more energy than is necessary to produce light. Halogen lights can get as hot as 1,100 degrees Fahrenheit. That's hot enough to cook an egg! Alternately, Energy Star certified compact fluorescent lights (CFLs) use 75% less energy to produce the same amount of light, last 10 times longer and produce less heat. If you feel like you need even more reason to switch to CFLs, consider that you will also save money over the lifetime of the bulb. Once you have made the switch to energy efficient bulbs, make sure lights are turned off when they are not needed. A great way to ensure that this happens is with motion sensors that will turn the lights off when everyone has left the room.