suggestions for chilling a terrarium?
I have been toying with the idea of setting up a terrarium for cool to intermediate growing epiphytes, especially Pleurothallid orchids. The biggest problem seems to be keeping the temps low enough with lights going. Has anyone had any experience with chilling a terrarium? For my purposes I would like to be able to keep the terrarium about 15 fahrenheit degrees below ambient room temp, with about 220 watts of flourescent light on top. I thought about perhaps modifiying a portable refrigerator or freezer, or using a reef aquarium chiller somehow, but I wanted to see if anyone has tried any of these things on a terrarium. Any help or suggestions would be highly appreciated.