Try the "No-Nonsense, Simple Approach[s]":
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[*]Replace one of the lamps with a very low wattage lamp - like swapping an existing 75 watt PAR 40 with a 40 watt R 30 - or even an A 19!,
[*]Replace one of the lamps with a Compact Fluorescent setup of 9 to 21 watts.
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This usually makes the point of the Thermal Protection well understood!
Scott SET