New Grower GPW...What?

[EverythingsHazy]

What if it's used to measure personal achievement? Let's say over a 12 week period with a 20/4 light cycle I grow 360g with 360w then the next 12 week grow in the same room with the same light cycle but different lights and I get 400g from 240w...to me I think its a handy bit of maths if the parameters are set right.

If you are keeping the timing exactly the same then you can leave out the step of calculating the hours of lighting because it is the same, but if you let things go until they look done then chances are you arent ending every grow on the same day each time.