Well this is what i found on http://users.lycaeum.org/~npkaye/lightingfaq.html .......

"MH lamps are available in 175,200, 400 and 1000 watt sizes. HPS lamps come in 50, 75, 150, 400 and 1000 watt sizes. Son Agro comes in 430w only, but it works with a 400w HPS ballast. Each lamp requires its own ballast, which comes with the fixtures that are designed to use these lamps, and are also available separately."

So i think im fine....
SittinStoney420 Reviewed by SittinStoney420 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