I'm tinkering with these COB LEDs with onboard drivers. They're designed for floodlight type use. Price is definitely good, IF they last. They're no-name Chinese, so they might not work out in the long term. I bought some 100W units in warm white (2500-3200K) and I'm going to do some testing and see how it goes.
These two 100W COBs are temporarily only attached with one screw each and have no heat transfer goop yet. I'm waiting on some taps to thread holes into the heat sink for screws. Had to put the COB panels at funny angles to catch existing holes in my used heat sink. Two 100W COBs do fit end to end on this heat sink.
Got a couple used heat sinks pretty cheap on Ebay. I don't think passive cooling is going to work. Heat sink gets pretty toasty during testing. I probably will add a fan or two to the fin side. More testing needed...
The COB panels seem reasonably well made. Having onboard drivers is super nice. Just solder 110V cord directly to the COB panel. You need a big soldering iron to solder these, as the solder pads are not thermally isolated from the aluminum backer, which sinks heat away really well. My Weller WES50 iron, turned all the way up, can just barely solder wires to the panels.
These two 100W COBs are temporarily only attached with one screw each and have no heat transfer goop yet. I'm waiting on some taps to thread holes into the heat sink for screws. Had to put the COB panels at funny angles to catch existing holes in my used heat sink. Two 100W COBs do fit end to end on this heat sink.
Got a couple used heat sinks pretty cheap on Ebay. I don't think passive cooling is going to work. Heat sink gets pretty toasty during testing. I probably will add a fan or two to the fin side. More testing needed...
The COB panels seem reasonably well made. Having onboard drivers is super nice. Just solder 110V cord directly to the COB panel. You need a big soldering iron to solder these, as the solder pads are not thermally isolated from the aluminum backer, which sinks heat away really well. My Weller WES50 iron, turned all the way up, can just barely solder wires to the panels.