I like to use 6500K lamps in my T5HO fixture during bloom to supplement the HPS. If all you have is the blue light it may not be optimal but the plants should still grow well.
Shovelhandle Reviewed by Shovelhandle on . 6500k for flowering too? I am in a tight spot and am unable to get the 3000k bulbs that I need for flowering. Will it hurt my plants to have them under the 6500k for flowering? Or would it make a difference if I took a couple of the bulbs out? ~A bit worried~ Rating: 5