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Do-It-Yourself (DIY) Question & Answer Forum
Maximum Light Fixture Wattage
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<blockquote data-quote="ProDave" data-source="post: 552691" data-attributes="member: 6969"><p>The rating of a lamp holder is almost certainly rated for a filament lamp (remember those old fashioned things almost impossible to buy now) where they were perhaps 10% eficcient, so 100W in, 10W of light and 90W of heat out.</p><p></p><p>If you put an LED in, as you appear to have, I don't know the efficiency but it will be a LOT better than 10% so your 100W LED light might at a guess produce 10W of heat, so you could have a lot more LED power without overheating the fitting.</p><p></p><p>I doubt the actual power is a consideration, a 240V 100W light will draw about 0.4 Amps. It would have to be a VERY badly designed light fitting to get bothered by 0.4 A of current.</p><p></p><p>What are you illuminating that wants that much power? I worked out when I put all LED lights in our house, that every single light in the house on and it was under 200W.</p></blockquote><p></p>
[QUOTE="ProDave, post: 552691, member: 6969"] The rating of a lamp holder is almost certainly rated for a filament lamp (remember those old fashioned things almost impossible to buy now) where they were perhaps 10% eficcient, so 100W in, 10W of light and 90W of heat out. If you put an LED in, as you appear to have, I don't know the efficiency but it will be a LOT better than 10% so your 100W LED light might at a guess produce 10W of heat, so you could have a lot more LED power without overheating the fitting. I doubt the actual power is a consideration, a 240V 100W light will draw about 0.4 Amps. It would have to be a VERY badly designed light fitting to get bothered by 0.4 A of current. What are you illuminating that wants that much power? I worked out when I put all LED lights in our house, that every single light in the house on and it was under 200W. [/QUOTE]
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