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Halogen

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No longer. LED-based fluorescent lamps use a lot less electricity than halogens for similar light levels - much of the energy emitted by a halogen lamp is heat, although it is more efficient than the equivalent argon-filled incandescent lamp. (A halogen bulb is still an incandescent type - it simply uses a different gas filling from the conventional bulb.)

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6y ago
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14y ago

for the least heat I would say the LED, Light emitting diode.

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14y ago

Incandescent bulbs produce less lumens per watt than flourescent or any of the hi pressure type

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9y ago

Please don't type "the following" if you don't follow it by a list.

The light bulb types, from most efficient to least efficient, are: LEDs; fluorescent lights; incandescent lights.

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Q: What light bulb types uses the least energy and therefore results in fewer greenhouse gas emissions?
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