Derating light fixtures

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Lxnxjxhx

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A flush ceiling mount light fixture is marked for use with 2 ea. 100 Watt bulbs max and 90 degree C wire in the junction box. With 25 C ambient, the thermal resistance is calculated at (90-25)/200 = 0.33 degrees C per watt. Can this fixture safely be used with 60 C wire and 2 ea. bulbs of no more than 50 Watts?
 
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