It was more an issue of humidity. The added heat from the lamp dropped the mositure levels considerably. I eventually did install a tank in the closet for the more moisture sensitive mounted plants and they really took off after that, but then I also added a fogger setup to the tank which also served to cool things off.
Only the cooler growing orchids suffered from the heat alone, but everything outside the tank suffered from the lack of humidity. I eventually sorted things out by installing a fan and a humidifier in the area. It's definately something that needs to be taken into consideration if one is used to growing under less powerful fluorecents that don't raise the temperatures quite so much.
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