i have a 4 speaker cabnit, i took out the bottem left speaker and put a light and pot, it stays from 50 to 70 degres inside it. i have a little fane the runs on AA rechargeable batteries it blows the stale air out a hole at the top of the amp. at nite i run a vaporizer in my room to increase the humidity.
Ok u should go buy a cheap 9.99 fluroscent light thats 12" or 16" long, cause that light does'nt give off heat and is used for a treble light, U can buy actually flowering and veggin bulbs at walmart for the small fixtures. Ur idea will work but you need CFLs, or a good fluroscent light and you will get results.