Advice for a COB 3'x3' Flower Area

i'm trying to replace a piece of shit Mars II 1200 in a 3'x3' area of my flower room.

Will this design cover it?

I like 4x75w in a 3x3

CobKits said:

I like 4x75w in a 3x3

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I wanted to do that, however I would have to wait a few weeks on the heatsinks, so I decided to go with 300w with 6 36v @ 1400mA

Part Number:
MODULED GIGA 15250-B

Dissipated Power Pd:
75 W
Theres a bunch at CDI...

thetr33man said:

Part Number:
MODULED GIGA 15250-B

Dissipated Power Pd:
75 W
Theres a bunch at CDI...

Click to expand...

it looks like those are setup for the citizen COB. thanks for the site though
I bought 8 of the SST x that @robincnn has on his site, but he is currently out of stock.

I run 4 x CLU1825 3500k @ 113 max a piece and it is perfect.

I only have a lux meter but on 16" centers the canopy gets pretty damn even lighting.

If I was going to run more than 4 I would look at the CXM22s.

Or run 4 x Quantum boards. They are in stock as well as slate 2 sinks right now.

sleepless_canuck said:

I run 4 x CLU1825 3500k @ 113 max a piece and it is perfect.

I only have a lux meter but on 16" centers the canopy gets pretty damn even lighting.

If I was going to run more than 4 I would look at the CXM22s.

Or run 4 x Quantum boards. They are in stock as well as slate 2 sinks right now.

Click to expand...

What are your LUX readings at 18"?

Im running 4 50 watters in a 2ft by 2 ft it seems too much.

Stealthstyle said:

Im running 4 50 watters in a 2ft by 2 ft it seems too much.

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I just read this page ...
https://www.rollitup.org/t/max-ppf-ppfd-with-and-without-co2.921830/
i wont be concerned about that with the 3x3 area however it is in the area where I have other COB bars, and I am running Co2.
I just watched @Growmau5 video and looks like i may be covered.
Why do you think its to much?

Well too much for my seedlings at 21 inches away and its hot here. gets down to 29c in my tent and 34 max in my tent at seedling level. i fried a few good seeds such as 7 herijuana seedlings. the others are going fine. But on critical jack is showing signs of either heat stress or over fert or both. only minor as im feeding at 1/3 strength. (gh maxigrow and seedling feed from a hydro store) the other three- two paki valleys are fine, with the cotton candy loving it, even looks like it needs more food.

Its hot outside, around 38'c and 25c at 3-4 am

sleepless_canuck said:

I run 4 x CLU1825 3500k @ 113 max a piece and it is perfect.

I only have a lux meter but on 16" centers the canopy gets pretty damn even lighting.

If I was going to run more than 4 I would look at the CXM22s.

Or run 4 x Quantum boards. They are in stock as well as slate 2 sinks right now.

Click to expand...

This ^. Stick 400W in a 3x3 and let there be light. We wanna grow fat, dank buds, light the shit out of the joint.

klx said:

This ^. Stick 400W in a 3x3 and let there be light. We wanna grow fat, dank buds, light the shit out of the joint.

Click to expand...

It worked out to about 900ppfd I was pushing.

Can't remember exact lux numbers before doing math.

But I pulled 17 ozs out of a 3x3 and it vegged under a Mars. First indoor grow.

I expect this round to be much better.

Just did a reading, and I am getting about 350 Par @ 30" with my cobs running at 230 watts. So just under 60 per cob.

I will bump up to about 400-500 par during veg and then 8-900 during flower.

Took 2hr to build