Do you think a 400w hps set up could get me the yield a 450w led could? Eventually what I want is to just use the whole room to grow 4 plAnts cause 5 and over is prison time where I live. I'd like to have 4 in each corner of the room under 4 different lights. I'm not rich so what lights would you recommend for a 12X12 room growing 4 plants to as big as I can get them?
Hps dual spec seems to do fine, but using the cfl for the first few infant weeks. More optimally suggested by those who've done both would be veg with MH and after flip stretch finishes, swap to dual spec hps. Some ballasts can operate both bulb types, you'd have to do your own research on that. LED from many reviews read is a minefield of bad products while the good ones are expensive. It's hard to 'weed out the genuine from the bs from the bias from the out right lies. I read the difference was quantity (hps) or quality (LED) but again that could all be wrong either way, I gave up reading due to the above, no reason why you should though, if you like them. A large majority seem to agree a typical dual hps or mh combo is reliably acceptable in results. While some bulbs/ballasts do cost a lot more for X/Y/Z benefits, again something you'd have to research to see if the added expense is worth it to you.
Those with space and few plants tend to use bigger pot sizes (yet more research ;p). Alternatively many also use some form of hydro but it's a lot more advanced/risky. Your lighting is going to be completely dictated by how much air exchange you have to regulate temperature. You can buy air cons or ac units and so on but like LED they don't appear to be cheap for meaningful ones.
Just something to consider, a 1000w light hung vertical with the plants growing around it would cover a sizeable canopy surface area. Maths is not my strong point so you'd have to find the surface area charts yourself for the exacts but most certain is that you will use a hell of a lot less W and create a lot less heat, requiring smaller scale/setting on airflow to also save on W. Would definitely remove the need for ac, country depending. You could also have a back up 400w that you can hang in place of the 1000W to counter heat wave temporary high night temps. It would be a cheap fix alternative to full scale temp control. That is compared to running say 4x 600w lights in a standard fashion that would very likely need it. They would use more than 2400W and don't forget the extra ballasts that will put out additional heat.
Even If the 4x 600's gave you 50% more ( I made that right up ;p) dry weight would it be worth using more than 100% power in lighting alone?. How much do you smoke in 5/6 month, at a low 3oz a plant from the 1000W vert you got 2oz a month, or 1oz a month for the year.
Theirs also multi spectrum T5's that have good W and heat benifits. People do good with them but it looks like a fairly high initial investment.
As a final off the beaten track option for ''I want it as cheap and nasty as possible''. Use uncle bens topping technique, open up the main colas with a wide tomato rack and shuv a vertical 125w cfl right down it's pie hole, x4. I don't know if you can do that with a cfl never mind leaf airflow so it's kind of ruined the grand exit ;[. It does sound sexy though, in a none weird way. Ok slightly weird.