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Light is a little complicated because various devices for producing it have various efficiencies. Light is measured in lumens. Older incandescent lamps produce 10-15 lumens per watt of electrical power. Halogen lamps produce maybe 20 lumens per watt and lasted much longer. Several years ago the best LEDs were also 20 lumens per watt. Now the best white LEDs are 5 to 10 times better than incandescent lamps, and they last for a decade or more. Expect almost all lamps to be LEDs in the next few years.

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17y ago

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