wouldn't the ballast be the same wattage as the light fixture, because the light fixture has 2 stickers on it, 1 sticker has the brand name and wattage which says 1500 watts then theres another sticker on the other side of the fixture that has alot of fine print and 2 blank lines, and on the one line it has the date the light was bought and the other line says 400 watts, i guess i might just get another 400w bulb for budding since i know for sure it will work in this fixture.