this is a noob question but i have to ask about light footprint.

ok so i
we working with an 8x10 space and i have 3 1000 watt xxxl magnums and 2 free hanging 400 watters. is it enough for that space? i want to be efficient as possible and harvest large. i plan on putting a 8 site diy uc set up and an ebb and flow setup in with it. and also is there a rule of thumb for figuring how much space lights will cover? i heard 50 watts per sf but that dont seem like much. anyway thanks for helpijng.

Is that your actual grow space or overall room space?

What will be the layout of the tables? How many?

Do you have a separate room for vegetative growth?

Why the 2 400's and not another 1000?

Thats a lot of heat/wattage.

If you (just for estimation) take your room and divide 8x10 up into 2 8x5 areas, then divide that up into 2 4x5 areas you get four 4' x 5' areas.

Thats 4 areas of 20sf.

A 1000w over each 20sf will give you 50w per sf. That is good lighting.

You have 800w left over for the last 20sf. That is still sufficient IMO but you might just go with a few less plants and use the 2 400's as supplemental lighting.

that is plenty of light.
1000's CAN cover a 5x5 area, each. but i dont like to go over 4x4.

well was going to try to use the whole floor space because have the 8 site uc and 4x8 table. 2 1000's over the uc with the 400's as side lighting because of the extreme growth i hear about.

ya have a different room for veg. the 8x10 is flower.

seems like 4x4 still has some shadows we dont like with a 1000.
does anyone know how many lumens per sf is optimum?

we have a 1 h/p chiller dealing with the heat. it is definatly a ton of heat.

I think a garden should have a minium of 1000 lumens per sq. ft. for veg, and 3000+ for flowering.
I use over double that is my tents however.
For you setup: 3x 1000 @ 125000 lumens each +2x 400 @45000 each=465000 lumens.
For a grow room of 80 square feet, that gives you: 5812.5 lumens per sq ft.
In conclusion, I think that you have a very good amount of light for you space.
I do think that is is a good suggestion to just get a 4th 1000 watt and arrange for more even coverage, you will get even more lumens with a 4th 1000, and overall better coverage and penetration.
My flower space is about half the size of yours and I am using 4x600 watts lights with fantastic results. Comes in at about 6500 watts per sq. ft.
Also, setting up cool tubes and running ductwork between your lights with an inline fan venting out of your space will provide much better cooling than any size chiller.
You still need the chiller for you water of course(assuming you are doing hydro), but as far as keeping the air temp down, cool tubes are the best.

3800 watts in a 8x10 space? That's 47.5 watts/ft^2. That's good.

we are running co2 though so didnt want to lose any. the chiller removes heat as well as acts as an air conditioner. the air coming out of the ice boxes is cold as fuck so i dont agree with the cool tube way removing more heat than a chiller. 1 hp chiller can remove 100% of the heat from 4 1000 watt lights and add air conditioning to your room. but i could be wrong i have always used a chiller. i do appreciate the response and will for sure use it. so thanks bro.