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Lumens Vs. Watts for LED Flashlights

There is a misconception that watts represent brightness. Brightness is measured in lumens; watts represent the power consumed by the bulb. Watts and lumens are unrelated, which is why many bulbs have an "equivalent wattage."

  1. Typical Values

    • Sixty-watt incandescents and 13-watt compact fluorescents typically have 900 lumens; 7-watt LED bulbs have around 300 lumens. Two-watt flashlight bulbs and half-watt LED bulbs typically have 20 lumens.

    Lumens and Watts

    • A bulb's efficiency is better measured by dividing the lumens by the watts (lumens per watt). The higher the quotient, the better the bulb's efficiency.

    Lumens Per Watt Values

    • The 60-watt bulb has 15 lumens per watt, the compact fluorescent has 69 lumens per watt and the LED bulb has 42 lumens per watt. Incandescent and LED flashlight bulbs have 10 lumens per watt and 40 lumens per watt, respectively.

    Considerations

    • Light color affects brightness. LED bulbs give off a blue-white light, and incandescents give off yellow-white light.

    Caveat Emptor

    • Not all LED flashlights or bulbs live up to their claims. Single-LED flashlights can be brighter than multiple-LED flashlights and tend to be higher quality than their multiple-LED counterparts.

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