How many cfl bulbs per shelf.

[crazzzymike13]

I just bought a small 4 tier green house from tractor supply. My shelves are 27" wide 19" deep. I'm going to make my own grow lights from an old alum vent pipe. How many bulbs per shelf you think? Could I get away with 1 bulb? I'm wanting to start seeds this year.

 

[Jared77]

I'd start with 2 per shelf but that's me. Especially since the CFLs are pretty low wattage they don't cost much to run so why not put 2 in. Id make sure I could add more bulbs if I needed to just in case though.