did i say anythin about replacing 400 hps. dude read the previous post before sounding like a jack ass
No one is talking to you dude.
No one cares that in your little LED experiment you seem to have gotten "more" or "less" of a certain sex. It's good for you, but for us, LED is a joke man. HID still produces the heaviest yields because the penetration power is there. I get the argument, I think most understand how LED's can compete given their unacceptably low levels of energy, but we just don't care because they are too damn expensive and they don't cover a large enough area.
There are many claims made about LED lighting. The above poster was repeating a claim he, and myself, have seen elsewhere. This is fitting because here you are making a wild accusation that somehow a plant's sex is determined by "nurture" rather than by "nature." As I understand plant genetics, this is not the case. It would seem that your increase in female plants is actually a result of the hermaphroditic plants leaning towards female in the blue light. In the red light the hermies lean towards their male genetics.
See, in this regard having blue LED light to "increase the number of females" is actually detrimental because it increases the chances of a plant producing male stamens and pollen late in growth. Possibly wrecking a crop with immature seeds. The red light system would be working with "truer" female plants and less hermaphroditic genetics.
I chose to take the time to read this entire thing to see what you are referring to Tahmi.Guhnn. The world doesn't revolve around you dude, this thread has nothing to do with you. Thank you for your input regarding LED lighting but it sounds to me, and to others, like more ridiculous, illogical, and unverifiable hype coming from someone pushing LED lights.
In regards to the OP, so as to be somewhat on topic, in this situation you are going to be best served by multiple light sources. The length of the space being twice the width is the issue. There are a lot of ways of going about it. You could use a 4 bulb T5 HO system in one corner and then drop a 250w HPS in the other. Add in a little false wall and you now have a Vegetative and a Flowering chamber. To fully use the entire space you'd need at least two 400w systems, each covering a 3x3 space. You could also drop a 600w or even a 1000w system on a light mover.
HID requires very adequate ventilation so keep this in mind. The plants themselves require quite a bit of air anyway and it is never in your benefit to skimp on ventilation. You really can't exchange too much air so get yourself a good fan no matter what light system you choose. Personally, I'd go with two growing rooms.
A 3x4 and a 3x2. In the 3x2 I'd have a 4 bulb 2 foot long T5 system and my vegetative plants or clones. In the 3x4 I'd have a 600w HPS and my flowering plants.
This would create an environment that I could then go "perpetual" with. Harvest a plant every 15 days or so. Each plant I would expect to be about 1/5 to 1/4 pound, veg for 30 days after cloning. DWC method would be too much of a pain in the ass. I'd probably go for coco.