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Victor6634 said:

That looks awesome how big an area will it cover

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I'm thinking a 3x3 easily let me finish the light and I can give you a more definite answer.

REALSTYLES said:

I'm thinking a 3x3 easily let me finish the light and I can give you a more definite answer.

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Thank you

Hybridway said:

800 good led watts = 4'x4' max yields IMO
Or 2 pounds from a 4'x4' average.
50 watts a sq'

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Don't tell me this man you'll get my hopes up.

Vato_504 said:

Don't tell me this man you'll get my hopes up.

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As long as you got the skills, decent strains, you got that all day! That's average good yields there.

Vato_504 said:

Don't tell me this man you'll get my hopes up.

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I've seen 21 O from a 400w lamp based on Gen5 Vero 29s. 42% efficiency by running them at low current. Current cob technology almost 3 years later is better than that at nominal current.

The output on that lamp was 350 watts, and at 42% efficiency it provided 147 par watts. 588 grams / 147 = 4 grams per par watt. If you know your par wattage then you can get an idea of what a yield expectation can be, 3.7 - 4 or maybe a little more per par watt if everything is straight.

I want to build a new light for my 2'x2'. I already have a spare hlg 185 c1400B. I want to go with a single heatsink between 16-20" but as short as possible, maybe even pin heatsinks with aluminum angle. Would 2 cxb3590 at 72v work for this setup?

I plan to put a PC fan on it for cooling. does this sound good or would you guys change some things? It's going to be for a veg tent.

GroDank101 said:

It's going to be for a veg tent.

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For a 2x2 veg I would use the 36v version. 56% efficiency and plenty of light. If you run them at 1.4 amps it's not out of spec but efficiency will suffer for more light than you need.

So would 2 or 3, 36v cxb3590s work with the 185 c1400b?
thanks @Rahz

There's a chance of going under the min voltage but I suspect they will fire up. Or go with three and a pot and cut the current down til you're just under 110 watts. That would give you about 60 par watts, about the same light as running 2 72v at 1.4 amps. More than enough to flower under. For veg you could actually turn them down to 80-90 watts and be happy with it.

Rahz said:

a pot

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what do you mean by 3 and a pot?
I'll probably run 3 to make sure I'm not running too low voltage.
so now I just need a good dimmer. I've never had a B version. is it difficult to attach the dimmer?

A pot is a type of dimmer, short for potentiometer. A potentiometer will have 3 solder lugs, one of the two dim wires contacts the center lug and the other wire contacts one of the other two (which one changes whether turning left or right to dim).

Thanks @Rahz that explains everything. Cheers

Hiya guys I've recently moved in to indoor growing and bought a cheap LED to get going. I'm getting good results but think I need an upgrade now. I'm looking for a veg & flower function with the light to penetrate my stealth box 130/60/60 cm. I have around £250-350 to spend. I know it's not going to be a top of the range but please all advice is greatly appreciated

Smee23 said:

Hiya guys I've recently moved in to indoor growing and bought a cheap LED to get going. I'm getting good results but think I need an upgrade now. I'm looking for a veg & flower function with the light to penetrate my stealth box 130/60/60 cm. I have around £250-350 to spend. I know it's not going to be a top of the range but please all advice is greatly appreciated

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I will be threatened with spamming if I say what I prefer.

I would really like to know of any HELP not PREFERENCES lol, would be of great help to me

Cobs. Either his cobs or her cobs. Cobs alone or cobs with LEDs surrounding them. DIY or prebuilt. From an efficiency standpoint most 3070 or 3590 Cree cobs blow regular led panels out of the water.

Big smo said:

Cobs. Either his cobs or her cobs. Cobs alone or cobs with LEDs surrounding them. DIY or prebuilt. From an efficiency standpoint most 3070 or 3590 Cree cobs blow regular led panels out of the water.

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except that nextlight and fluence are showing the value of smd chips which are not cobs. but otherwise I agree.

Yessir. Most. I'm actually looking into those 2 co's for a little extra umph.

PurpleBuz said:

except that nextlight and fluence are showing the value of smd chips which are not cobs. but otherwise I agree.

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And Samsung and Philips, for the DIYers. Also, Fluence's PPFD footprint is almost unbelievably uniform.

I'm running low on space and $ for testing LEDs. But I really want to put a Fluence VyprX vs PLC cxp250.
There is a bit of a wattage & price difference, but I think it would be fun to do and see.