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When to switch lights?

Surfer Joe

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When going from veg to flower, we switch to 12/12 light, but keep giving veg nutes until we see the buds starting then switch to bloom nutes.
We also change lights from MH to HPS.
my question is-
when do you change the MH to HPS?
as soon as you switch to 12/12?
Or when you see buds forming and switch to bloom nutes?
 

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