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How to Calculate Lighting Illumination How to Calculate LED Watts to Incandescent Watts

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Instructions

1Lumens are the amount of light produced by a bulb. Find the number for lumen output on the light bulb's box.

2Wattage is the amount of electricity needed to light the bulb. The higher the wattage is, the brighter the light will be. You can find the bulb's wattage written both on the box and on the bulb itself.

3Divide the light bulb's lumen output by the number of watts the bulb needs. For example, a 100-watt light bulb usually has 1800 lumens, so the LPW is 18.

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Tips & Warnings

Fluorescent bulbs last longer than incandescent, but their lumen output decreases over time, therefore manufacturers give two lumen ratings for fluorescent bulbs: an initial lumen rating and a mean (average) lumen rating. The mean lumen rating is determined at 40 percent of the light bulb's life. Buy light bulbs with the highest efficacy rating to get the most light from the least amount of electricity and decrease your monthly power bills.

Read more: How to Calculate Lumens Per Watt | eHow.com http://www.ehow.com/how_4897086_calculate-lumens-per-watt.html#ixzz1qMC95Z7i

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