Lighting Switch from MH to HPS...when?

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Hey folks,
In dealing with Auto's, at what point do I change the bulb to HPS from MH?
thanx!
 
when you switch to bloom nutes or vertical growth stops. just to give a good idea I change my 5000k cfl to 2700k around day 35-45. just all depends on how fast she matures.
 
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