Hey guys, sorry to be a downer- I tried vertical bare bulb 1000w hps, but wasnt overly impressed! I wrapped 4 ladies around with a fan blowing underneath to dissipate heat and that worked out well, had leaves touching the bulb and not burning. (Obviously I moved them away when I saw that) Trained and shredded into a stadium seating style with the outside taller than the middle, but I never really got as good bud formation as I do with an air cooled reflector. I tried it as a budget to avoid buying a reflector for two runs and both times I was less than impressed. The lack of concentrated heat is nice, but I feel you get less concentrated light as well. Maybe with a reflector built for vertical orientation it would be better. Just my two cents.