a computer never uses it's max potential....i think it uses around 50% of the max output
adjust the monitor to shut down 5 mins of inactivity
buy low watts new generation lamps that consume as little as 15 watts and put out 5 times light.....
from what you say, i see that you're after to grow an entire room at least 12sqmeters....around 100 plants or so.....buy if you can and a couple electric heaters, not for use, just having them around just in any case.....i have to agree with the previous statement....a loner never gets caught...one last thing to do and maybe the most important so as to be almost 100% safe is to try and find out how many kilowatts your household can consume every hour...if it's around 4 kw/h then you can't really have 4x1000watt HID running as the power would go down the moment the lights came on.....connect the lights and try to see in the power meter how fast the wheel goes round....figure out a schedule in which no one will see it running.....i do that....9 in the morning lights are off....to get an idea of what i am talking about....the wheel goes round and round....in 680 complete circles=1 kilowatt....if you have 3-4000 watts imagine how fast it is going to turn around...