I am not using Kryptons, but I am using gold color xenons in the fogs. If it were me I would not go any higher than 65 watts in the fogs. They are a small enclosure and that much heat in the small enclosure is asking for trouble. I have been running the Gold xenons (65 Watts) for 9 months now with no detrimental effects to the foglamp enclosures. The colored xenons come in gold, purple,and green and they are 65 watts.
Alan [}
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