Thanks for running a great community site. I have been reading all I can and am dying to get started. I haven't tried growing in about 18 years! But then it was a footlocker in my bedroom....

Planning a grow in a shed in the Northwest. I can keep temps down when the lights are on, but how cold can I let things get at night? Will the glow from a space heater upset the plants?

The space will be 4.5' wide by 3' deep by about 5' tall. I am planning 2-400 watt HPS, with floros to begin with. Should I keep the floros running on the sides when I switch to the HPS?

Has anyone figured out a way to 'harvest' the heat generated by the lights so you can use it to keep things warm at night? I have been thinking about a water loop from the lamp into the ground below the room, but I also think of stupid ideas like feeding tuna fish mayonaise.......

Peace,
Banzai