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A 42W bulb is only going to produce 42 Watts of heat (well, a little less since some of the energy escapes as light (roughly 3 - 5% for a halogen)). So as long as the fixture is rated for at least 42 watts, that bulb will be fine. The max wattage limit should be noted on the fixture somewhere, either on a sticker, or embossed in the metal. I think your ...

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