Light bulb uses 10 percent of energy & wastes 90 percent to create heat

light bulb wastes 90 percent of energy-min

Although many of us have switched to LED bulbs for their extended lifetime and energy savings, you can’t forget where it all started.

There’s still a debate on its inventor, but there’s no arguing that the incandescent bulb was a step toward a brighter future.Incandescent bulbs cost much less than their energy-efficient alternatives – mainly CFLs (compact fluorescent lamps) and LEDs (light emitting diodes).

An incandescent bulb can cost as little as 70 cents. Meanwhile, a CFL bulb sells for at least a few dollars and a LED starts at $10 but usually runs around $20.


Its invention was an amazing feat, but it may not have been the most efficient. Roughly 10% of the energy from an incandescent light bulb is used to create light, the remaining 90% of energy creates heat

Incandescents also don’t last as long as CFLs and LEDs. The typical incandescent bulb lasts about 1,000 hours, while a 15-watt CFL bulb lasts 10,000 hours and a 12-watt LED bulb lasts 25,000 hours. In other words, incandescents last about a year while CFLs can last 10 years and LEDs up to 25.

All told, your energy costs can be 25%-80% less by switching to energy-efficient bulbs, according to

Despite the savings, many still stick with incandescents because they typically don’t spend that much in the first place on lighting in their homes.

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