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I suspect you mean a 24 volt 250 watt bulb running on a 12 volt supply.

If so, it will burn with a dull orange color. The exact color is uncertain, as the filament of an incandescent bulb is usually made of Tungsten, which has a high positive thermal coeficient of resistance. What that means is that as it gets brighter (hotter) the resistance increases drastically. It is however certain that it will burn cooler than it would on a 24 volt supply.

If you make the opposite change, a 12 volt bulb on a 24 volt supply, it will burn out with a very bright flash.

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Q: What would happen if you use 24V 250 bulb instead of 12V 100w?
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