i had an issue with a 400w magnetic.... call em up and tell em, they'll send ya a new one... the replacement has been workin fine since i got it(2mos).... i think they get used magnetic ballasts, and some of em work for a little while, then die.
i had ordered two bulbs, and the first hps did this, so i put in the 2nd, and it did it to the 2nd one as well... so i tossed in the MH conversion, and it worked fine for a month, then took a crap.
more likely than not, the ballast and bulb is dead. htgsupply will replace it no prob, make sure you get a replacement bulb.
