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Do-It-Yourself (DIY) Question & Answer Forum
Converting a vehicle lamp into a household light.
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<blockquote data-quote="Geoff1946" data-source="post: 500020" data-attributes="member: 28452"><p>Is it a tungsten filament type car lamp? </p><p></p><p>These have a low resistance when cold, the resistance rising as the filament heats up. Hence you need more than the 40watts briefly to start the lamp, a phenomena known as a, "switch on surge" .</p><p></p><p>It's likely that the electronics in the supply unit you have is switching off to protect itself from the surge, then trying again to start, giving the effect you describe. </p><p></p><p>Using a six amp supply unit would probably solve the problem but I wouldn't guarantee it. If you can find a Non regulated PSU, or one that's just a transformer, as you don't need DC fro a tungsten lamp, that would work.</p><p></p><p>Alternatively could you use an LED lamp? That would need some improvisation to physically install, but would use much less power. One sold as suitable for either car side light use , or traficator use if you want it brighter may suit.</p></blockquote><p></p>
[QUOTE="Geoff1946, post: 500020, member: 28452"] Is it a tungsten filament type car lamp? These have a low resistance when cold, the resistance rising as the filament heats up. Hence you need more than the 40watts briefly to start the lamp, a phenomena known as a, "switch on surge" . It's likely that the electronics in the supply unit you have is switching off to protect itself from the surge, then trying again to start, giving the effect you describe. Using a six amp supply unit would probably solve the problem but I wouldn't guarantee it. If you can find a Non regulated PSU, or one that's just a transformer, as you don't need DC fro a tungsten lamp, that would work. Alternatively could you use an LED lamp? That would need some improvisation to physically install, but would use much less power. One sold as suitable for either car side light use , or traficator use if you want it brighter may suit. [/QUOTE]
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Converting a vehicle lamp into a household light.
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