How Do You Know the Light Output Lumens of a Light Bulb?


Quick Answer

A light's output in lumens can be found by checking the Lighting Facts label prominently displayed on the packaging of most lighting fixtures. If lacking a Lighting Facts label, the output of lumens can be determined through the use of a watts to lumens calculator.

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Full Answer

When mathematically determining the amount of lumens produced, the basic formula is the total power in watts times the luminous efficacy (lumens per watt) equals the total number of lumens. For instance, if a bulb has a wattage of 75 and a luminous efficacy of 25 lumens per watt, the total lumens would be 75 x 25 lumens, which equals 1,825 lumens.

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