Probably gpw would be the best way. My journal is in my sig but I am going to need to organize it a bit as it's a bit chaotic and hard to tell whats under what light. I didn't actually plan for a comparison, it just worked out that I can do it. So I'll put all the relevant data/pics together in a separate journal I think. I measured the mars cob @ 105w at the wall and the autocob @ 58w. They are autoflowers so I want to have atleast 3 grows of the same strain done at the same time to even get a little bit of a fair comparison. So one more full grow to go.
@MarshydroTina what should the voltage be set at for the Mars ? Where should I take the reading from ? I am guessing I want to meter it across the cob ?
I feel that it's starting to dim over time and I would like to check to make sure it's correct.