I would suggest you consider the 8 foot long double tube flourescent HIGH OUTPUT lights and fixtures. I have both (regular flourescent and High Output) in mine and the High Output just put the normal daylight fixtures and bulbs to shame. The cost is almost twice and so are the results. As My fixtures have aged 4-5 years they hum in the cold and if you are trying to zero in on a leak, that sucks. I have been told that I could remedy the hum by changing the ballast, but in 20 minutes or less the hum stops when they are on.

If I had it to do over I would run the High Output Lights only everywhere--better light and no hum!

thats my 2 cents