When to put under HPS???

When is it a good time to go from floros to HPS, My plants are 4 days old and under floro,s 80 watts, When should I put them under a 400HPS? Thanks for any help!!!
 

Xsample

Member
The rule of thumb is 2 weeks.

Simon
Agreed. After that, I usually start with the HPS light away from the top of the plants and take the light down gradually until I reach the sweet spot. Then adjust the height of the light according to growth!
 
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