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You talk about tubes specifically so I assume the 60 watt fixture is also designed for tubes. In such a case you should not use a higher wattage tube.

If you were to replace a 60 watt incandescent bulb with a compact florescent of 75 watts you are correct that the heat would be less. If heat were the only de-rating factor you would probably be okay. Not sure how this is handled in the code.

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Q: Can you use 75 watt fluorescent tubes in 60 watt fixtures which is a different question because fluorescent lights do not operate as hot as incandescant bulbs?
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