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:
Powder Puff Reviewed by Powder Puff on . Which Light To Use? Is There A Difference? PICS Hello again everyone, I was wondering if there is a difference in 400w HPS lights. My buddy gave me 6 bulbs that say "LUMALUX LU400 SYLVANIA" He also gave me one bulb that says "PHILIPS 430w SON AGRO" My ballast is a 400w HPS. Would one of these be better to use than the other. Also, ive heard that older bulbs can have different effects on your plants etc. How should i choose which one to use out of the six? Picture: One HPS is already in my ballast and not shown, but in the pic, the 5 Rating: 5