ok after some more research i found out i should probably get a ceramic metal halide, seeing as how i have a non-digital ballast. i found this one at bulbs.com:

CDM400S51/HOR/4K/ALTO - 146506

anyone found any cheaper or better? i heard there was a high defect rate on cmh, is that still true?
geoluv Reviewed by geoluv on . Hortilux conversion bulbs questions hey i have a 400 watt hps ballast and i want to get this bulb: Eye Hortilux Metal Ace Conversion Bulb - 400W from 4 hydroponics.com by Growco Indoor Garden Supply i was just wondering if anyone had used one and how they liked it, is it really worth the extra 35 bucks for the hortilux over the normal hps to mh conversion bulbs? im using a home made ballast from insidesun.com (im poor), any problems? the description for that bulb says its 7 inches fat, is there a thinner hortilux hps to Rating: 5