Autos: when to switch from MH to HPS?

Hey all. First grow, four autos, 32 days from sprout. Three Easyryders are showing clear and developing pistils. I can't detect any obvious pistils on the fourth plant, a 60-Day Wonder, but I can't spot any male signals either. It looks exactly like the others sans white hairs. So far I've been using a 400W MH. When should I switch to the 400 HPS?

TheDudeNextDoor said:

Hey all. First grow, four autos, 32 days from sprout. Three Easyryders are showing clear and developing pistils. I can't detect any obvious pistils on the fourth plant, a 60-Day Wonder, but I can't spot any male signals either. It looks exactly like the others sans white hairs. So far I've been using a 400W MH. When should I switch to the 400 HPS?

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Combining both spectrums has been shown in test studies to provide a more complete spectrum and happier "praying" plants. Also the MH's blue spectrum has been shown to provide UVB radiation which actually increases resin production and THC %. Check it out I think Ed Rosenthal writes about these findings. Blaze1

obviously the more light the better and duelspectrums are better then single "of course" but if i can only have the 1 light going then i would of switched at day 14 with autos at the latest 21 days in.

it will help to bring on flowering faster becuase of the time of year associated with the hps spectrum

Interesting Resinant. I will look into that b/c I'm already planning to buy a 600 sometime in the fall.In the meantime, though, I've only got the one light. The MH is actually one of those conversion bulbs. I thought I was supposed to wait until bud began to show before switching with autos. Sounds like I've waited too long? I just started lights-off now. Any reason I shouldn't switch to HPS for tomorrow's light's-on?