Quote Originally Posted by BobBong
Um... Is it a new bulb?
Sounds like the HPS bulb is not firing , aka dead.
He said he tried two bulbs now, the latest one he bought he insisted the shop test!

Maybe he is turning the bulb on and off too quick? - maybe that had some effect in making both of the hps bulbs duff? Could that have an effect - no idea - I've never done that ;-) I would imagine it is not good.