growrooms x 2 questions?

[baldyhippy]

Hi Folks.

In a bit of a delema here,Ive just cropped 12 plants wich were from clone and vegged for 3 weeks potted up along the way finishing in 6.5 litre pots.

Theses where in a room sized 6foot x 6foot x7foot high so 36 square feet,under 1 600hps and 1 400 hps & I only managed an oz per plant..roughly!

Now after some maths I realise where I went wrong yield wise..not enough light covering the floor space :thumbsup:

All Ive got are the combined 600hps and 400hps and without splashing out more money,I was thinking of turning my flower rooms around and using my veg/clone mother room to flower in,the size of this room is a nice 6 foot x 3 foot wide,Im hoping to veg clones till october and flower intime for xmas,what you rekon folks then?...should I swap things around and will a combined wattage of 1000 wts be sufficient in my little room...Ive got 4 inline fans ranging from a 10" to 3x 6" for intake extraction,so thats covered....any ideas suggestions most welcome.

Baldy :hippy:

baldyhippy Reviewed by baldyhippy on 08-18-2007. growrooms x 2 questions? Hi Folks. In a bit of a delema here,Ive just cropped 12 plants wich were from clone and vegged for 3 weeks potted up along the way finishing in 6.5 litre pots. Theses where in a room sized 6foot x 6foot x7foot high so 36 square feet,under 1 600hps and 1 400 hps & I only managed an oz per plant..roughly! Now after some maths I realise where I went wrong yield wise..not enough light covering the floor space :thumbsup: All Ive got are the combined 600hps and 400hps and without Rating: 5

[Weedhound]

I was taught that you usually go by 100watts per square foot (we're talking HID's here.)
A 1kw should cover a 10 x 10 room so it certainly sounds like you have enough wattage to me.

Just guessing.....but it also sounds like you are just cramming too many plants into too small a space so none of them get the space and ventilation they need to thrive.

[psteve]

100W/sq.ft. is great, but the bottom line is 50W/sq.ft.
If you can get above that, you'll be 'in the zone'.
A smaller room should help a lot.

Weedhound, your math is wrong.
10x10 is 100 sq.ft.
1000W would only be 10W/sq.ft.

Baldyhippy...
Your 6x3 room is 18 sq.ft.
so you need at least 900W, so your 1000W would put you in 'the zone'.

[baldyhippy]

Cheers guys for your time in replying.

Steve Im thinking more and more now about the little room Cheers bud....maybe in time Ill fill the other room I rekon I would need 1800wts for that space.

Plan is to extract into my attic (its above my grow area) via a cf & 10" fan,intake will be via an open window and probally a 6" fan for this..sound good?

Once again cheers folks.

Bh.

[HighTillIDie]

sounds like heat problems, maybe you have really bad light spread... and bad nutes... either that or you fucked up and harvested your plants at the completely wrong time

also if i'm not utterly retarded, your grow pots seem a little small

[psteve]

Cheers guys for your time in replying.

Steve Im thinking more and more now about the little room Cheers bud....maybe in time Ill fill the other room I rekon I would need 1800wts for that space.

Plan is to extract into my attic (its above my grow area) via a cf & 10" fan,intake will be via an open window and probally a 6" fan for this..sound good?

Once again cheers folks.

Bh.

I'd recommend three 600W HPS, for best efficiency and coverage, or two 600W HPS and two 400W MH for broader spectrum, and even more lumens.
Venting upwards is usually best for heat extraction. :thumbsup:
Fan size depends on CFM (fan efficiency) and room size.

[baldyhippy]

Again thx Steve the 3 x 600 would be great in the room ive been using,but like I say I dont want to go spending more cash on upgrading my lights (not yet anyways) Doing a little search Ive decided on the 6x3 this time around and hopefully better my yield,my fan efficiency will/should be ample for a good air exchange,so with 18 square feet to play with if ive read the maths correct that Ill be a nice 59wats per s/foot...with room for upgrades

Many thanks.

Bh.

[Weedhound]

I'm sorry....I may have said this wrong but I stand by my info.....1kw should cover a 10x10 room fine. This is information I got from someone who's knowledge I trust completey so whether or not I do math right.....1kw should be plenty for his room. Mines 8 x4x 8with 1k watt and no problems or yield issues unless I just get too greedy to give everyone enough space. I still think he's got too many plants. I fit four-6 decent sized in mine. He's got 12.

I did always suck at math.

[baldyhippy]

Weedhound Im listening mate just getting confused...heres how I now see things!

Ok the room Ive just used to flower 12 plants in was 6x6x7=36 square foot of floor space.
In here,they where under a 600hps and a 400hps=1000wts.

That should av worked out around 30 watts a square foot so in a 10x10 room it would be lower as steve said 10watts per square foot.

So my new room of 18 square foot is half my last rooms size but with the same 1000wts should get me around the 59watt per square foot...surley being better?

My 12 plants weren,t massive things,flowered at 18" and ended up about 2 and a half foot,there was just so much spare room around them I knew it was the lights,so either I had to upgrade my lights or downsize...so downsize it is,and im probbally going to try and fit a 25 plant sog in this area...Ill let you know how it goes.

Thanks.

Bh.

[jamstigator]

Not much light at the edges of a 10'x10' room with just one 1k light. I use a 1k light in a 4'x4' hydrohut, and that seems about right, maybe a tad overkill. That comes out to about 60-ish watts of light power per square foot, so just a little more than the optimal 50. I could cover more area, but I'd have to raise the light significantly to do it, which would increase the distance between the light and the plants. And light intensity doesn't diminish linearly with distance, it's much worse than that. Let's say you're generating X lumens/sqft at 1 foot distance. At 2 feet, it's half that. At 3 feet it's 1/4 of that, at 4 feet it's 1/8 of that, and at 5 feet (the center of a 10'x10' room to the edges) it's 1/16 of the light intensity that exists at 1 foot from the light.

The general rule of thumb is: 400 watt HPS light = 3'x3' square. 600 watt light = 4'x4' square, and 1k light = 5'x5' square. Thus, a 10'x10' room would, realistically, need four 1k lights, if you used the entire space for flowering, and wanted reasonable yield from all of the plants. If you don't care about yield, then sure, you could use one 23-watt CFL in a 50'x50' room. Just wouldn't get much from each plant.