It all depends on the roof height. The eight foot high eff. and h/o are a great way to go but as you say are pricey. There is a new style of fluorescent and they come in banks of I believe six 4's. Two styles available for lower and higher ceilings. i would check with your local electrical wholesaler and see what they would suggest. Or if you know a contractor see what they are pulling out to reinstall the updated lighting. I installed 7 liquid 400wt and 6 eight foot h/o's and it cost me zero. Now I just have to update the paint booth. 50 year old eyes just don't cut it.