If the canopy expands to the walls of the cab, it's going to stop any light from going below that line. It doesn't matter if you've got mylar on the floor; if the light can't reach it, it can't reflect. Light can't penetrate through leaves. This isn't rocket science people.

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does more lumen per sq ft not benefit the top of the canopy if all other conditions are optimal?

being a smart alec such as "this is not rocket sciece people" only insults yourself...

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http://www.rollitup.org/grow-room-de...net-least.html

I've got a sweet cab me and a buddy built. Its actually a wardrobe. The 2'x4'x5' flower chamber has a carbon scrubber vented through a hooded 400W HPS then up out of the flower chamber into a 2'x4'x18" top chamber to the blower exiting out the back of the cab as it turns into a muffler/homemade filter. The top is also used for seedlings and clones. Ballast for the light is on the top of the cab. The mother chamber is on the side and is 2'x2'x3' and is above three shelves. Mother chamber has three cfl's. Flower and Mother chamber are coverd in mylar. Intake fans mounted on light traps into both the flower and mother chamber, light trap inbetween the two chambers. We're filled to capacity with 4 in each chamber right now. 4 soil in mother and 3 hydro/1 soil in flower. 3 female white widows confirmed right now. Fingers crossed on the rest. Sorry no pics.

if he was saying that his cab was going to be smaller than 3x3x3 then i dont think he can fit more than a couple plants in there or was intending on more than that.
smaller would be fine in his case
stop being so damn rude

He has made no such statements and I'm not interested in what you think he can do with anything.

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Hey, I'm no expert, but even with a 1000W in a 2X3X6' cab, you couldn't approach the light intensity of the sun. If you can keep the temps within an acceptable range, the added intensity would only give you fatter, denser buds.

I also agree that there are too many other factors involved to say how small a cab you could put a 600W in with a 500cfm fan. Ambient temps are a real consideration. If you put that set up in a cool enough room with the light vented from outside the cab, the cab size would be smaller than you would be able to grow in effectively.

Best bet for a height restricted cab would be SCROG.

So, I'm just rambling because I am f*ing STONED! Ha Ha Ha Ha!!!

~Rock~

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Silence is a true friend who never betrays. ~Confucius~

shit, i didnt even give the bell, here you go... ding! ding! ding!, GET IT ON!

Aesome comments, Thank you all,

Fullmetaljacket- yes, my bad, definatly cool tube equipt.

Userfriendly- sorry but i got to disagree aswell, I think i can use the compactness to get a better penetration to the lower bud devolpment, for one, not to mention optimal overal density which = more weight but i guess well see when the results come in

kocab- i think im starting to get an idea, or feel for it. that 3 by 3 is a good ideal, with optimal coverage for like a sog, which is what i was thinking, but what would you say about 3' by 2' by 2.5h? Im have 'tiny' in mind but with the same concept of maximum coverage. Y'all?

i feel 2.5 is too short even for SOG. You will have like 12" for the plants max...

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http://www.rollitup.org/grow-room-de...net-least.html

What if he Sog/LSTed?

Sexxy - I think there is a cab somwhere on here that has a 250w hps in a 2.5 h cab, it might even be shorter, its done by WW or somthing.

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Ahh shit, i smoked all my stash and im flat broke... Here we grow againhttp://www.thefreshscent.com/wp-cont...basementop.jpg

I think if you put the bulb in one of the top corners of the box and got a bake_a_round dish to make a cooltube with then you would have no problem with the cab, paint it white to make it reflective, and run with that shit. lowest id go would be 2.5-3 ft tall tho....
then keep it simple, grow from clone if you can so that you canopy stays the same height.