Best light setup for yield 20×20 room

andy s said:

make each area a 5x5 the cross lighting will cover it just fine

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^ this is actually good advice.

Jimmy Verde said:

How well do u think 8 xxxl magnum hoods with 1000 watt bulbs and phantom ballast would light it I can get them cheap like 900 for all

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This would fill half the room if each one lot a 5x5 area. The rest could be storage and aisle space.

No way you're running those without AC.

andy s said:

have you used them? in a 3x3 tent and also a 4x4 tent to see if it can cover it? everyone i knw that uses them cover a solid 4x4 with them. you saying no and then saying they can cover up to that is really contradicting in a way lol. its like saying a piece of paper covers a 3x3 up to a 4x4, when really its a 4x4 sheet.. get what i mean lol? if you have 3 on each side youll get cross spec thats why i said 5 to 6 lights. so, yes they will cover a 4x4.

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Honestly. Not yet, but I read about the par values a lot. Those numbers at the corners ain’t shit without overlap or a tent reflecting all 4 sides of a 4x4.

Jimmy Verde said:

How well do u think 8 xxxl magnum hoods with 1000 watt bulbs and phantom ballast would light it I can get them cheap like 900 for all

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I’d say jump on it and look for another 8... that room can handle it if you properly air cool it and add a decent 3 ton AC, or several (4x 750cfm intake fans) blowing through through a dust shroom above the duct lines to positively pressurize the room with dry 30-40F air. I’d still have a thermostat controlled AC to keep things consistent if/when things do heat up. Murphy’s Law = indoor grow. Preparing for the worst is something every grower should be doing.

andy s said:

4 on each side isle in the middle i think would kill it. scrog em out grow em nice and big haha probably a 2 month veg or so on em. should get over the 8lb mark for sure

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Why assume only 1 per light with those lights you wouldn' be running an efficient space with less than 14!! Good luck btw!!

Yodaweed said:

Don't listen to johnny he's an idiot.

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ive chose to ign

Toohighmf said:

Honestly. Not yet, but I read about the par values a lot. Those numbers at the corners ain’t shit without overlap or a tent reflecting all 4 sides of a 4x4.

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right which was gonna be the layout of the room, you achieve a good number by cross lighting with the 315, in return double the area almost for 30 extra watts every 2 fixtures

Mr b 2263 said:

Why assume only 1 per light with those lights you wouldn' be running an efficient space with less than 14!! Good luck btw!!

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stated he should get over the 1 per light for sure bud. some people can only get 1 per light, others get 2 or very close

andy s said:

ive chose to ign

right which was gonna be the layout of the room, you achieve a good number by cross lighting with the 315, in return double the area almost for 30 extra watts every 2 fixtures

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I still don’t think cmh penetrates like a QB. The lower you hang a cmh to the canopy you risk heat and you shrink the coverage. Overlapping QB’s have higher PPF than cmh and you can lower with great coverage. Though coverage with 2 315’s over a 4x4 might do it with higher temps..

Toohighmf said:

I still don’t think cmh penetrates like a QB. The lower you hang a cmh to the canopy you risk heat and you shrink the coverage. Overlapping QB’s have higher PPF than cmh and you can lower with great coverage. Though coverage with 2 315’s over a 4x4 might do it with higher temps..

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i think 2 315's in a 4x4 is overkill

Toohighmf said:

Like I said, I’m trying the HLG 550’s that I’ve seen as cheap as $850 that draw 510 from the wall and produce about 1200 PPF @1760 btu’s. That’s comparable heat to a 430w HPS with the output of a 1000w SE

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I been looking into this lamp. The specs and numbers are unreal. Just mind blowing. Lower a little more in price..this could be a game changer. Any good threads on the hlg 550? Sounds too good to be true.