Listen to this shit...

That timer has more than enough capacity to fire a 400 watt MH. have you tried to plug the ballast directly into the wall outlet? If it fires up ok, then you have a defective timer that I wouldn't use for a paper weight, for safety reasons. I suspect that you have an issue with you ballast or bulb though.
 
As an electrician I have to agree that this sounds more like your ballast than the timers.
Also, I own 3 of those and they have all been working great for a little less than a year
now. Hope you find the problem.
 
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