if we are talking red hps spectrum then yes i have done it it will just make the plants a bit more stretchy than if you used a MH bulb there are mixed spectrum hps bulbs you can get also i think there a good mix with autos
I've been running 2700k, 3500k, 4000k cobs for three years now and I honestly don't see any significant differences. I just used and put away two of my 600 watt HIDS I used for one grow. One had MH the other HPS, I'll agree with the @Trichome farmer that the HPS side stretched just a bit more.
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