I am moved into a very old house two years ago, and I have recently decided to go ahead and start replacing lightbulbs. Today I removed and 11 white light bulb from its place in a ceiling light, and I noticed that there is a black mark in the spot where the lightbulb would’ve been close to the ceiling. I know other lightbulbs in the house are only nine whites, and I am curious to know if the wattage on this light bulb was too high or if there is another reason why a black mark would have been left behind. I do not know when the last time this lightbulb have been replaced but it’s going to be at least two years ago minimum.
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1What is an "11 white" and a "9 white"? Speech to text in your phone? You can edit your question but must use the same browser you asked in initially (or register your account from that original browser).– Harper - Reinstate MonicaCommented Jul 14, 2023 at 18:21
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1 Answer
Heat from light bulbs causes a column of rising warm air. This carries dust to the ceiling. Over many years it causes staining above the bulb. Your current bulbs, 9 or 11 watt (not white) LEDs are not what caused this, it was done over years by earlier bulbs that were hotter.
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1More than just staining. I've seen paint crack over the years from the heat of incandescent bulbs. Commented Jul 14, 2023 at 19:17