I retrofitted a 48 inch Odyssea hood with 2 x 250 watt ARO ballasts and a 2 x 54 watt T-5 HO ballast (it had PC's in it). I could have bought a new one, with the new style ballasts, for less $$.
You can find the replacement/newer style black ballasts that are made in China, but they are about $70 + shipping. For the extra $30 or so, I would just go with the ARO's. -JMO