I haven't had that many run ins with electronic ballasts, only servicing existing signs with these ballasts installed. I've serviced 3 signs in the last year or so, and all three required ballasts still on warranty to be replaced. I noticed 2 things about them. Condensation within the sign, not standing water, seems to have been the cause of the failure, though physically the ballasts looked fine. No matter how tight a sign is built, condensation, at least in our area, is going to be present. Magnetic ballasts don't seem to have this problem. The other thing I've noticed with the 2 brands that I've dealt with is that the wiring is not standardized, so if it's Brand A it's best replaced with another Brand A, etc. This problem may be dealt with eventually.
I know John doesn't like to toot his own horn, at least on this board, but an answer to technical questions would be appreciated. Is condensation a factor in the failure of electronic ballasts? And if so, is Ventex addressing this issue?