dude ive had the same problem as you. i sent back countless bulbs and that was not the problem. so we returned the ballast for a new one and the same problem. i think the electronic switch in the ballast is junk. im thinking of returning the digital for an old school kind when i have a couple weeks for a return.i have a 600watt digital greenhouse system. it is suppoesed to automatically switch from mh to hps when i change bulbs, but everytime i switch the bulb from mh to hps the hps runs for like 2 weeks and then stops working. does anyone know why this is happening
dude ive had the same problem as you. i sent back countless bulbs and that was not the problem. so we returned the ballast for a new one and the same problem. i think the electronic switch in the ballast is junk. im thinking of returning the digital for an old school kind when i have a couple weeks for a return.