I think it was Zandor that used a higher wattage bulb with his ballast.. For months, or years.. I'm not entirely sure though...

What you should do is, make a test run for two days or so.. Just keep the Phillips on for 48 hours, and keep a close eye on it.. If nothing happens, and the temps and shit are fine, there will be nothing wrong with using it!

Go for it! :thumbsup: