Sorry for the OT post but I'm pretty sure someone here will know how this stuff works... An office near me was recently demolished/remodeled. It had retrofitted LED lighting in fluorescent fixtures. The remodelers were smart enough to save the "bulbs" but not smart enough to save the "ballasts" (DC power supplies). Once they figured out that they couldn't easily use them, they gave a bunch to me. I'd like to use them but I'm having a little trouble figuring out how. The "bulbs" are labeled: 15F18120-45 15 watt 36vdc constant current I'd like to put four in a fixture and I'm trying to understand what kind of driver I need and how to wire it. I was thinking of using a Mean Well LPF-60D-36 like this: http://www.ebay.com/itm/Mean-Well-LPF-60D-36-AC-DC-POWER-SUPPLY-Dimmable-LED -DRIVER-36V-60W-CLASS2-/161857068172?hash=item25af6edc8c:g:9hQAAOSwA4dWHVn5 and wiring the "bulbs" in parallel to it. But after realizing that I'm not completely sure what a "constant current" power supply does and doing a little "googling" I don't know if that's the right approach. Any help greatly appreciated, Bill S.