Im used to pulling 1.5 to 2 per light with 4 plants rdwc. 12 years hydro experience.
I imagine I should be able to do same with 2 plants per light.
I never used co2 before. Can anyone tell me a good co2 generator?
Yeah, the best one is the GrowGPS. It's a commercial burner and it's for use with Nat Gas, and should be installed by a professional. I run a bunch of them connected in a series, all connected to the CHHC-4 Brain. It has 10 burners, and you can choose to turn on 2, 5 or 10, to keep heat down in your space. It's called the
VCG-27 Variable CO2 Generator
http://grow-gps.com/products/co2-equipment/
Your space is small - you will only need one VCG-27.
HOWEVER - It's sold out indefinitely, and the people at GrowGPS that you reach on the phone are not helpful at all...so call around to all your local shops and see if anyone has one laying around, cause the model has been out forever - otherwise you can get the one from HydroFarm, which works fine too - I have one, it's good, you just can't adjust the # of burners that are on to keep heat low, but it does the job.