A question about fixing a LED lamp. LM301B\H

M

MrRv

Member
hello everybody.

so my LM301B 240W had enough apparently and half of one of the board stopper working, this is the exact setup I have:
lm301b 240w
charger.jpgled.jpg

so that happened:
were fed.jpg

and I have ordered a LM301H 120 watt board and replaced the half working board:
i tried.jpg <- new.jpg

I connected it exactly the same way it was connected before, but here comes the new problem, whenever both lamp are connected only the new one (LM301H) works, when I disconnect the new lamp on the right and leave only the old one connected it is working but I assume thats bad cause its 240W goes to a 120W board.
any way they wont work both, why is that?

should I order another LM301H board and it would fix it? I could later manage and make another 120W board with what is left.
or should I actually order a LM301B board to match the old one.

does the power adapter has anything to do with this issue? tried 2 different ones and the same result, but 2 is not enough for concussions I assume.

sorry for the long thread and thank you for your atention.
 
Grow Lights Australia

Grow Lights Australia

Well-Known Member
I'm not familiar with these boards but looking at the LED layout it appears the UpLux has 18x 3030 LEDs in series for around 50-52V (max) whilst the other board has 16x in series for around 46-48V (max). That's based on roughly 3V per 3030 and UV diode, and around 2V per 660nm diode. So yes, @PJ Diaz and @Rocket Soul are on the money. That driver is meant to have LED panels wired in series instead of parallel, so you probably do have them in parallel, which is why the new board is not lighting up because it is has lower voltage requirements.

@Rocket Soul is right that if you wire them in series they should both light up. No need to buy another panel until you try this first.
 
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