If you've tried compact fluorescent lamps, you know that they require a warm-up period to reach full brightness because the gas they contain needs to reach its proper operating temperature. Halogen lamps also require a warm-up period. LED lamps immediately reach full brightness the moment you turn them on. Once they reach end of life, disposing of compact fluorescent bulbs requires some environmental care. These lamps contain mercury, released when their enclosures break or shatter. By contrast, LEDs pose no such threat.
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