QUOTE (macwell @ Feb 1 2009, 01:09 PM)

Compostverte; thanks for the reply. What I meant by stealth is this, the amount of electricity I'd use to run a 400-600W hps would stand out where pulling 250W with the enviros will only pull power equal to a couple of extra light bulbs left on. So, it won't make my electric bill double, (stealth). I've read that the ratio is 1 gram per W, which would put me somewhere around 250 grms, which is almost a pound. This being my first grow, will be more experimental, before I can shell out $100.00 for seed stock, I want to know that my system will work and I learn from the 1st grow. I can always add more, or different lights later if things warrant.
250watt will pull the same as 250watt so an hid of 250watt will take the same electricity as a 250watt cfl but the hps/mh light will have much more lumes and power and so increase yield well over a cfl , also the 1gram per watt scenario is for expert growers who very rarely if ever hit the magic 1gpw amount and that is with using hps lights with excellent ventilation and neigh on perfect growing conditions and using hydro instead of soil.
Using a cfl you will no where near get closer to 1grm per watt 0.3-0.6 if you are very lucky, cfl's don't penetrate your canopy much and have to stay around 2inch from the plant tops where as an hps will be around 6-12inch off the plant and penetrate around another 12inch down or so on top of that.
Cfl's false economy, used to use 800watt of cfl and had 10-11 oz my best ever , but now 1 400watt hps will give me 10-12 oz each time with half the electricity and less heat.