At How Many Wpg Do You Need Co2?

[snowflake311]

Right now my light is low about 1.6 wpg. If I want to upgrade again but don't want co2 how many wpg should I shoot for.

 

[killudead]

Right now my light is low about 1.6 wpg. If I want to upgrade again but don't want co2 how many wpg should I shoot for.

you dont want Co2? You are depriving a basic building block of the plant. But to answer the question. IMO, i would say nothing above what you currently have.