Driver for Bridgelux EB strips - confused.

erbgrow

New Member
Hello everyone! I've trying very hard to avoid buying a blurple light, however I'm in the UK where components are harder to get / more expensive and my understanding of electronics in limited.

I'm thinking of using 12 x Bridgelux EB 2 foot strips and a Meanwell HLG-320H-24 driver. According to the led gardener parallel strip build tool (I can't provide a link as my post count is too low) this driver will run the leds at 75% and give me 287watts, which should be enough for my 2x4' grow space.

There are a few things which are confusing me, and searching the internet has only added to my confusion:

Firstly, I believe as I'll be running the strips in parallel, the driver should be constant voltage, however all the drivers that are available look to be constant current (I'm searching "hlg-320h-24" on mouser uk)

Secondly, the ledgardener page says it's important to adjust the drivers output voltage down to the system voltage, which in my case is 22.8V.
Would I be correct in saying that if the driver is constant voltage then the voltage can be adjusted but not the current (amps), and that if the driver is constant current then the amps can be adjusted but not the volts? or have I got it the wrong way around, or just wrong?

Thirdly, the system current of this build would be 12.6A which sounds scary. I understand I wouldn't just daisy chain one strip to the next, but is 12.6A OK?

I really appreciate any help anyone can offer, I've spent a few weeks researching and trying to work it all out, but I'm going around in circles and my brain in close to imploding.
 
Hello everyone! I've trying very hard to avoid buying a blurple light, however I'm in the UK where components are harder to get / more expensive and my understanding of electronics in limited.

I'm thinking of using 12 x Bridgelux EB 2 foot strips and a Meanwell HLG-320H-24 driver. According to the led gardener parallel strip build tool (I can't provide a link as my post count is too low) this driver will run the leds at 75% and give me 287watts, which should be enough for my 2x4' grow space.

There are a few things which are confusing me, and searching the internet has only added to my confusion:

Firstly, I believe as I'll be running the strips in parallel, the driver should be constant voltage, however all the drivers that are available look to be constant current (I'm searching "hlg-320h-24" on mouser uk)

Secondly, the ledgardener page says it's important to adjust the drivers output voltage down to the system voltage, which in my case is 22.8V.
Would I be correct in saying that if the driver is constant voltage then the voltage can be adjusted but not the current (amps), and that if the driver is constant current then the amps can be adjusted but not the volts? or have I got it the wrong way around, or just wrong?

Thirdly, the system current of this build would be 12.6A which sounds scary. I understand I wouldn't just daisy chain one strip to the next, but is 12.6A OK?

I really appreciate any help anyone can offer, I've spent a few weeks researching and trying to work it all out, but I'm going around in circles and my brain in close to imploding.

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You probably have nothing to be worrying about. Why?

HLG-320H-24 = Fixed Voltage and Current
HLG-320H-24A = Adjustable, just need a small screwdriver.
HLG-320H-24B = Comes with an extra cable where you can install a potentiometer in order to dim easily.

Just make sure you get the A version!

Anyways, just remember to check the specification sheet, meanwell's spec sheets are pretty detailed.
 
So with the A version, you can adjust both volts and amps, is that correct?

Also what would happen if I left it 24v and my systerm is only 12.6?
 
Voltage Multilplied by Current == Power
Voltage * Amps == Wattage
24V * 12.6A == 302.4 Watts
22.8V * 12.6A == 287.28 Watts

So all things being equal, if you increase either the voltage or the current your power consumption (and output) will go up.

On another note, Since you'll be wiring in parallel the Powersupply's output will be 12.6A but each strip will only be using about 1.05Amps each. So if it were 20 strips you would nee 21 Amps, but that would still be 1.05 amps for each strip.
 
Looking at the datasheet for the EB series Gen 2 strips, the maximum forward voltage is 21.6V and the driver selection voltage is a maximum of 22.1V.
If the driver is 24V and I don't correctly adjust it down, will this damage the strips?

I appreciate the help btw, and tbh I think I just need reassurance before I start this that I won't burn the house down.
Screenshot 2018-01-03 17.11.51.png Screenshot 2018-01-03 17.11.51.png
 
I'm happy to help, we've all been there! Don't stop the DIY train ;D

So with the A version, you can adjust both volts and amps, is that correct?

Yes!

Looking at the datasheet for the EB series Gen 2 strips, the maximum forward voltage is 21.6V and the driver selection voltage is a maximum of 22.1V.
If the driver is 24V and I don't correctly adjust it down, will this damage the strips?

I appreciate the help btw, and tbh I think I just need reassurance before I start this that I won't burn the house down.

If you want to be nitty gritty, well there is always a slight chance that you might damage your strips. Yeah... But on a real world scenario that's probably not going to happen. Usually high quality strips like those start acting funny like flickering on and off really slowly if they're "over-volted".

In all seriousness though, i don't think you would damage the strips by going 1, 2 or even 3 volts over the limit. But if you're going for Gen 2 strips, then consider getting a 20V driver instead of a 24V driver... Why? Well, I've found it a little more difficult to find suitable drivers for the EB strips Gen2, as the Gen1s can be easily run with a 24V driver and, sadly, 20V drivers don't come by as easily, so be sure to consider that!
 
This is all great information :)

Well, I've found it a little more difficult to find suitable drivers for the EB strips Gen2, as the Gen1s can be easily run with a 24V driver and, sadly, 20V drivers don't come by as easily, so be sure to consider that!
There is a HLJ-320H-20A, that would be perfect right?
 
This is all great information :)


There is a HLJ-320H-20A, that would be perfect right?
Maybe consider getting 2 smaller drivers, so you don‘t waste so much energy early in veg. If you are talking about a flower room only, forget what I said.

2x HLG-120H-20A for example. That would be like 260+ W, I think that‘s enough for nice buds in flowering.

And you can use one driver dimmed down to 50% for small seedlings or cuts.
 
The A version has atleast +10% more power than rated. And as you stated out, even 240W would be „just“ (irrelevant if it’s) enough. ;)
 
Wouldn't 2x HLG-120H-20A drivers be only 240W, so only just enough?

I have an HLG-120H-48A running in a small tent, and i can go up to 174ish Watts on the power meter if i crank up both knobs. I don't see the need to go beyond 140Watts on a 2x2 though.
 
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