I think that it would be okay as long as it was 12/12 but for best results use Mh for veg and HPS for flowering because of the light spectrum differences. Why do you want to use both? Do you have 2 HID setups but only one HPS bulb and one MH bulb?
Sean6942 Reviewed by Sean6942 on . Lighting Question is it alright to use HPS along with MH during flowering? Rating: 5