(4) CXB3590, 36v @1.4mA, 3x2'

ttystikk

ttystikk

Well-Known Member
TJ baba said:
Think I will need fans? driver remote mounted outside tent
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The chips make far more heat than the driver will. Trying to eliminate fans is in my estimation a game of diminishing returns; the chips run more efficiently and last longer the cooler you operate them, so it seems like a no brainer to actively cool them; longer life and slightly more light on the plants, what's not to like?

Two small, silent fans would be entirely sufficient.
 
Airwalker16

Airwalker16

Well-Known Member
ttystikk said:
Working my way there...

So an hlg 300- 2100 would drive said COBs at 36V x 2.1A = 75.6W
300W/75.6W=3.968 COBs @75W apiece.

Now, each of these outputs will have a unique efficiency rating, lower as watts rises.

With my last batch, I chose higher efficiency over higher power. My next design will be closer to the example I just used, slightly lower efficiency but half again as much overall power and output for the same number of chips.
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You're getting there, indeed
 
SSGrower

SSGrower

Well-Known Member
My .02 on configuration - although your plant will follow fourier mathematics to predict this action coupled with all other variables it would be very difficult. For a Scrog or even canopy a planar arrangement would totally work. Imo if your canopy variance is more than a foot there would be a benifit to being able to position leds at different heights. If your interisted in details of how I approached the design check the link in my sig.
 
TJ baba

TJ baba

Well-Known Member
According to my math I will get 56% efficiency @200w, 112 par watts / 6sqft =18 ⅔ × 45 = 840 ppfd of light
 
ttystikk

ttystikk

Well-Known Member
TJ baba said:
According to my math I will get 56% efficiency @200w, 112 par watts / 6sqft =18 ⅔ × 45 = 840 ppfd of light
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Wellllll, maybe;

I looked they the thread and I didn't see where you mentioned which dimming option you got on your driver. If you got the B version with external dimming, if you leave those leads capped the driver gives 8% more than rated output, or 216W/4=54W per chip. Driver efficiency costs another 8W, for a total from the wall of 224W, this verified by my Kill-a-watt.

That's how I went from 811 to 824PPfD over 6 sq ft and so your space will see a bit more.
 
TJ baba

TJ baba

Well-Known Member
I just realized I ordered the 1400A driver with no cords for the potentiometer dimmer, is this OK or would you guys return it for a 1400B?
 
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Airwalker16

Airwalker16

Well-Known Member
TJ baba said:
I just realized I ordered the 1400A driver with no dimmer, is this OK or would you guys return it for a 1400B?
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It's your call.
The A version does dim, but only from 100-50% it's controlled by a little screw underneath a rubber seal on the driver itself. It can just be a PITA and also you can't go below half power which can be annoying.
 
sixstring2112

sixstring2112

Well-Known Member
nice build and setup.and fast work.you should get a small fan up above the heatsink just to move air past the lights a lil for some added cooling.just a sugestion,maybe you already had that planned out.
 
TJ baba

TJ baba

Well-Known Member
Update after about 4 days of growth in here my chronic plant looking kinda droopy, any ideas on how to fix this? I just added water, and more soil to fill the water gaps. Others are Durban poison, blue dream haze,and dinafem crit 2.0 in that order
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Getgrowingson

Getgrowingson

Well-Known Member
Raise your lights a bit and make sure your not over watering. Probably just getting blasted by those leds and isn't used to it. Back them off a bit and I'm sure they will perk right up as long as your not overwatering
 
TJ baba

TJ baba

Well-Known Member
Getgrowingson said:
Raise your lights a bit and make sure your not over watering. Probably just getting blasted by those leds and isn't used to it. Back them off a bit and I'm sure they will perk right up as long as your not overwatering
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This plant sprouted and vegged under 150w hps and then flowered for 20 days under 300w hps and that's when I moved it under the cxb3590s so you might be right.
 
V

VegasWinner

Well-Known Member
nice fixture and clean build. I thnk your OG is not used to the light. perhaps a dimmer @75% might help acclamation to the new digs. peace
 
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