Guys I need help. I have a 400W switchable ballast and I'm in veg now and the MH bulb is working great... But I want to switch over to flowering this week and my 400W HPS bulb wont light up??? WTF is wrong? Took the bulb back to the store and tested it there... it works fine! I switched the socket (just cuz i had a spare one and i thought it might not be making the connection)... still nothing. I dont think it's the ignitor cuz the MH is working... This SUX!!!
Please anyone have any suggestions? Help a brother out.
Thanks