Whatever you put in...put in fluorescents. I had 16 incadescents in a 22 x 28 and could not see squat. The first move I did was to swap out the 4 corner lights with 500 watt halogens. Much brighter and way hotter. On a summer day it will be cool in the morning but kick on the lights and it heats up real fast. The next thing I did was to remove one bank of lights and put up two 8 foot fluorescents end to end (16' run) What a difference. I then added 4- 4' sections down a wall. Much, much better. Next thing on the to-do list is remove the rest of the incadescents and add three more rows of 16' runs on the ceiling. It will be as bright as being outside on a sunny day. And no heat from the bulbs. So whatever you do....go with fluorescents. You will be glad you did in the longrun.