Chip Green
Well-Known Member
Its adding up to me, 4 of the 1120mm EBs on each MW185.... I basically have the same thing going, only I have 8 EB 560mm strips on each MW185/1050....
Bridgelux EB-series on a 2' x 4' SCROG
- Thread starter graying.geek
- Start date
canadian1969
Well-Known Member
I dunno, it was Daniel and Vegas that mentioned it as the OP said something about being only 175 watts at the wall or something. I dont think its dimmed as that driver doesn't dim, just the ones with B at the end right?
How did you wire yours?
Moflow
Well-Known Member
Danielson999
Well-Known Member
400w of strips give off the exact same amount of heat that 400w of cobs do. It's a misconception that they run cooler.
But having said that, I don't believe the OP has 400w running in his 2'x4' tent. It looks far too dim in there to me.
Danielson999
Well-Known Member
Yes they dim via the screw. He could actually be running them fully dimmed which would put them at 50% power for an 'A' series driver.A drivers dim on driver via a screw?
graying.geek
Well-Known Member
Yeah, this all makes sense to me from the perspective of the output side of the driver, but what confuses me is trying to balance driver input with driver output. If I understand correctly (this is probably the problem), if each driver puts out 190v, in a 4-strip serial configuration each strip will receive 47.5v at 1.05a = 49.9w. So 4 strips on each driver should be using ~49.9w (47.5v * 1.05a). For 8 strips I would expect the 2 drivers to pull 8 * 49.9w = 400w on the input. But when I plug both drivers into a kilowatt meter, I get 116.5v, 1.08a, 122w (this should be 116.5v * 1.08a = 125.8w but I attribute the difference to the $20 kilowatt meter).
It seems like watts in should = watts out, but there's clearly an error in the way I'm looking at this or I'm wired wrong (I'll post pics of my wiring later today). Whatever I'm missing, any lucidity you can bring to this would be appreciated.
graying.geek
Well-Known Member
This is what I'm concerned with. Perhaps the serial wiring pattern I used is incorrect. Here's what I have. Input appreciated:
MrTwist1
Well-Known Member
LEDs only pull as much as the forward voltage they are rated for. Your strips likely each draw around 24v each so what your Kill a watt is telling you is certainly in the right range. You could probably run all of those strips off one of those drivers, although technically you would be slightly out of advertised spec (but it would likely work fine). If you want more power you will either need to run the strips harder (not really recommended) or buy more of them. I would go for another 8
BuddyColas
Well-Known Member
Your 4 strips are wired in parallel...what you want is to wire them in series. And when you do, better move your lights up and/or dim because you will be raining down about 4 times the photons on your girls!
graying.geek
Well-Known Member
Thanx, Twist. I'm not sure where you're getting the 24v from. Can you elucidate? I'm using the BXEB-L1120Z by the way. From the spec sheet the Fv at 1a should be ~50v, since the driver maxs out at 190v output, 190v / 4 strips should give me ~50v/strip. What's wrong with my calcs?LEDs only pull as much as the forward voltage they are rated for. Your strips likely each draw around 24v each If you want more power you will either need to run the strips harder (not really recommended) or buy more of them. I would go for another 8
Yeah, depending on the yield on this grow, I think I'll probably add another 4 strips for a total of 12.: said:I would go for another 8
graying.geek
Well-Known Member
Thanx, Bob. Yeah, the A ver of these have a builtin actuator, but both are turned up to max. I've no external dimmer.
BuddyColas
Well-Known Member
If you have a volt meter check the output voltage of your power supply.
graying.geek
Well-Known Member
Ok. 191v, 176ma The measured amperage makes no sense to me.
graying.geek
Well-Known Member
Wouldn't happen to have a diagram showing multiple strips wired in series would you?
bakedPotatoe
Active Member
Wow,people are still stuck here on this..they might run a bit cooler but for you to match the same output you dont need the same wattage...
The reason they might run cooler is the ability to remove drivers from the grow room..
graying.geek
Well-Known Member
Correct. No dimmer wires on the "A" version.
Im using 8 of the 560mm strips and a hlg185c-1050b. This is how mine are wired. Yours look to be in parallel. These things are pretty damn bright! Pulls 217w without the potentiometer hooked up.Wouldn't happen to have a diagram showing multiple strips wired in series would you?
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BuddyColas
Well-Known Member
That is what you're looking for GG!