Question on parallel wiring cobs.

I'm just trying to confirm that this would work?

HLG-240H-C2100B.
It runs 3 CXBs at about 73-75watts each.
If I wanted to run 6 of them though, at half that, 36-37watts, I could run 2 series wired runs of 3 cobs and run them both in parallel, right?
Something to this effect?
2 rows of 3 cobs, each rows beginning positive and ending negative leads both going to the drivers pos/neg outputs?

I'm pretty sure that should work.

Why not all 6 in parallel?

Airwalker16 said:

I'm just trying to confirm that this would work?

HLG-240H-C2100B.
It runs 3 CXBs at about 73-75watts each.
If I wanted to run 6 of them though, at half that, 36-37watts, I could run 2 series wired runs of 3 cobs and run them both in parallel, right?
Something to this effect?
2 rows of 3 cobs, each rows beginning positive and ending negative leads both going to the drivers pos/neg outputs?

Click to expand...

That will work if the cobs forward voltage is the same. Cree used to have in their data sheets to not run the cobs in parallel not sure if they have changed it like Bridgelux has. Bridgelux has voltage bins now so if the chips are the same bin they say you can parallel them. If the voltages differ too much you will get current hogging.

grilledcheese101 said:

Why not all 6 in parallel?

Click to expand...

The driver wouldn't startup, got to get the voltage over 59 volts really you are better off getting closer to 119 volts as you would be using up more of the drivers wattage. All 6 in parallel would only be 36 volts.

Thank you so much.

Airwalker16 said:

I'm just trying to confirm that this would work?

HLG-240H-C2100B.
It runs 3 CXBs at about 73-75watts each.
If I wanted to run 6 of them though, at half that, 36-37watts, I could run 2 series wired runs of 3 cobs and run them both in parallel, right?
Something to this effect?
2 rows of 3 cobs, each rows beginning positive and ending negative leads both going to the drivers pos/neg outputs?

Click to expand...

Perfect example for series-parallel connction with COBs and side effect is you get much better efficiency. COB's need smaller heatsinks or could be run passively cooled with the same heatsinks as before. Its often cheaper to add just a 2nd string of COB as to build as complete new fixture to increase efficiency. CXB eff. at 1050mA is ~176lm/w for 3500°k/CD bin, thats ~2,5μMol/j. Not too shabby for reused COB's...

Randomblame said:

Perfect example for series-parallel connction with COBs and side effect is you get much better efficiency. COB's need smaller heatsinks or could be run passively cooled with the same heatsinks as before. Its often cheaper to add just a 2nd string of COB as to build as complete new fixture to increase efficiency. CXB eff. at 1050mA is ~176lm/w for 3500°k/CD bin, thats ~2,5μMol/j. Not too shabby for reused COB's...

Click to expand...

I'm just glad to have confirmation it will work. Am