t5 closet to 1kw tent, thoughts?

[meetzu]

here is what i plan to purchase for my first REAL setup.
-76x76x76" mylar tent
-GrowBright 1000w premium hps ballast
-easy cool 8 aircooled hood
-6" tallboy carbon filter and 424cf inline fan
-FF ocean forest soil
-Technaflora Recipe For Success nutes

seedlings will start under my 2ft t5 10000 lumen hood and then be transplanted gradually up to 3 or 5 gal grow bags (haven't decided on that yet). veg & flower will be under the 1kw hps

i have a ph meter and up/down. also a 285 cfm inline on a dimmer for venting the tent. how necessary is a tds meter when growing in soil? there is also a $58 RO water filter i was considering if anyone has reason that it would benefit me considerably in soil.

is there anything i am over-looking? seems to me that this would be a fine setup for growing indica dominant strains. any insight would be appreciated as i plan to purchase all of this come friday evening (payday ).

 

[cannatari]

40 square feet x 1000w is only 25 watts per square foot of light, all the textbooks recommend 80+ watts per square foot. You will not get dense nugs of quality bud with that much light. Anybody with me?

 

[SickSadLittleWorld]

40 square feet x 1000w is only 25 watts per square foot of light, all the textbooks recommend 80+ watts per square foot. You will not get dense nugs of quality bud with that much light. Anybody with me?

Yeah, that tent is too large for a single 1000w. I'd opt for a smaller tent or more lights.

And a TDS meter is completely unnecessary growing in soil. A pH meter is always handy to have, though.

 

[meetzu]

i was under the impression that lumens should be considered over watts because lumen/w differs so much over light type and is a measure of power consumption and not light production unless comparing very similar, if not identical, bulbs and ballasts. am i wrong on this? it seems logical to me.
this would be ~3500-3600 lumens /ft^2. that is if i use all the floor space and i likely wont use quite all of it due to equipment.

going to do some more math including inverse square and dimensions of tent. thanks for the replies though.

 

[SickSadLittleWorld]

The lumens/watts is irrelevant...the footprint and light output from one 1000w bulb in that HUGE tent isn't enough. It could light maybe half the tent with a good reflector but the footprint is much smaller than you think.

And your logic is assuming light output is consistent at any distance from the bulb, which isn't the case.

 

[meetzu]

okay...
38" from center of my tent are the furthest walls. given the lamp being 18" above canopy that means furthest distance of the top of my canopy to my lights is 42". quite a bit of distance.

according to this chart anything beyond 36" is insufficient foe a 1kw hps bulb:

so given the 18" height is a fixed distance from the canopy the greatest radius i can achieve with the light still being sufficient is ...

18"^2 + x^2 = 36"^2
324 + x^2 = 1296
x^2 = 972
x = ~31"

so with minimal efficacy at the edges a ~5.17 ft by ~5.17 ft tent could be illuminated with this bulb. edit : this would be the closest walls (not corners of the tent)

so you guys are def right on it not being enough. thanks for the push to do the math.

 

[meetzu]

The lumens/watts is irrelevant...the footprint and light output from one 1000w bulb in that HUGE tent isn't enough. It could light maybe half the tent with a good reflector but the footprint is much smaller than you think.

And your logic is assuming light output is consistent at any distance from the bulb, which isn't the case.

it wasn't assuming the light output is consistent at any distance from the bulb, it was that lumens were more important than watts. no where did i mention distance until the following post. sorry for the confusion.

 

[meetzu]

so i suppose i'll be going with a couple of these 600w's with easy cool 6's for lighting then. kind of a $158 bummer though. it will be worth it to get it right though.

 

[SickSadLittleWorld]

it wasn't assuming the light output is consistent at any distance from the bulb, it was that lumens were more important than watts. no where did i mention distance until the following post. sorry for the confusion.

I must have read it wrong. I think I read the ft^2 as ft^3. Either way, its irrelevant since you have figured out that it isn't enough light in that space.

Why not two 1000's? Two 600's would work well in that space but two 1000's would work even better, IMO.

 

[BlueFish]

Two 1000 watters will also cost you over 100 dollars a month in electricity while the two 600s will cost you around 60 dollars. Two 1000s will also put out a lot more heat, and will require more expensive ballasts. Two 600s should be fine.

 

[meetzu]

yeah. a couple digital 600's will cost me around $515 and 2 1kw magnetics would be about $730 (digital around $850) plus the additional electric. I have some money to dump into this but still prefer to spend enough to be quite adequate rather than overkill is all.

on another note... 4 days! pumped!
hoping to get some cash/walk in (one htg store is somewhat local) discounts/hookups for spending about a grand at once. sure would be nice.

 

[BlueFish]

Only had good experiences with HTGSupply, you can't go wrong with them.

 

[meetzu]

yep. waiting on the tent still. 2x 600w digital greenhouse ballasts in easy cool 6's with a 484 CFM vortex and tall boy carbon filter.