These bulbs usually boast how many thousands of hours they'll last. They do last a lot of hours. Except that by the middle of their life-time the light gets weaker, darker/bluish (depends) and the bulb takes longer to warm up to its full color, weaker as it then is. Some will also buzz terribly after aging. Next to the noise, mercury poisoning is a relief.
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"Tout ce qui est exagéré est insignifiant." ("All that is exaggerated is insignificant.") - Talleyrand
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