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all you need is a relay,you have to attach the 12/12 timer to the "signal pins" and the "switching pins" switches between the ballast and 2 600w lamps. don't know the details, i haven't made it yet :) search it and you'll definitely find something.

greetings green-thumbed stoners i purchased a bale of kekkila B1W substrste... unfortunately i couldnt find the unfertilized kind but from what i read its supposed to have an acceptable ph, dolomte lime (which is great since i can only buy hydrated lime) , mycoryza and wetting agent . its...