Ninety percent of the electricity used by incandescent light bulbs is given off as heat, which is wasted energy and money.
Ninety percent of the electricity used by incandescent light bulbs is given off as heat, which is wasted energy and money. Here's a bright(er) idea: Switch to LEDs, CFLs or halogen bulbs instead. They use as little as 20 percent of the electricity — reducing your energy bill and your carbon footprint.