I took it back to the store and got a new ballast. The original bulb was emitting a high pitched sound, so they replaced that aswell.

The guy serving me said he personally was uncomfortable with the idea of running a 250w bulb at 300w (This ballast is sold as being able to use 250,400 and 600w bulbs). So if I have any more issues I will use my 400w bulb and run that at 300. If it cannot run 250w bulbs I will probably take it back and buy something else.
PhatJay Reviewed by PhatJay on . My digital ballast just failed mid 12/12 in the 1st week of flower. Bought a new digital ballast last week. Tonight it went off 6 times in total, over a period of 3 hours (about 2 minutes a time and for 5 mins while I removed the new lighting and put my old cfls back in). This is a stable strain that doesn't seem to be prone to stress (i have been growing it for 18 months). I think my girls will be OK, but I would be nice if someone who has had this happen to them, could provide some reassurance. Rating: 5