REALSTYLES
Well-Known Member
didn't you burn up some cobs running them parallel? Due too voltage droop?Bill, you need to forget about the Vf. You don't really have control over that with the drivers we use. Most of us use full Constant Current drivers ( hlg185h-c2100b or similar) and the only reason you need to know Vf is to see how many COB will fit on a given driver.
The driver you are referring to is also a Constant Current driver ( hlg185h-48b or similar), but it has a voltage limit (48v) and will run CC 3.9Amps until you draw 48v then it converts to a CV and limits it at 48v. The hlg185-42 will run CC @ 4.4 amps and the hlg185-36 will run CC @ 5.2 amps. If you run the 36 volt, then the driver will limit you to 36v. If you buy the A version, then you can adjust the drivers voltage out between 33v and 40v.
Now when you do use a CC/CV driver you can add as many COBs as you want, but you must run in parallel to maintain the voltage.
The CC drivers your running in series and the driver will only give the set amperage to each and every COB until you run out of volts out.