于 2005-03-09 06:26 400Wx2 w/ 2 T5....or 400W w/ 2 VHO or use 250W but use probe start ballast or HQI ballasts... ballast = 牛 because probe start or HQI ballasts will overdrive the bulb!!!! so when use those on a 250W bulb it maybe tune out to be running 275W-350W...... I've even see 250Ballast tune out to run 37XW.... but it will shorten the life of the bulb!!!!!