Coolthanksbye
New Member
I'm currently in my first grow and everything has been going great. I've been using a 400W MH for 18/6. I just switched over to 12/12 and changed the bulb to a 400W HPS. The issue is the HPS doesn't seem to be working right; the middle glows a faint purple when plugged in and that's it. The MH bulb works fine in the same fixture. The MH and HPS bulbs are 38K lumens and 55K lumens, respectively. Would I be greatly decreasing my yield by sticking only with the lower-lumen MH for the flowering stage, or do I need to exchange my HPS and change to that as soon as possible? Any input is appreciated!