I've had a brief search and nobody seemed to have a similar problem to mine so...

I bought a set of Ben like most of us one of the lights seems to not come on from time to time. If it doesnt switch on, i'll switch it off and it will work the second time weird. The other light works perfectly every time. I bought a set of h4s-3 but i dont think it's the bulb's problem, ballast not firing every time?? what do you guys think?? anyone has a spare ballast that i can borrow for a week or so (to test my theory)