250W/400W Electronic Magnetic Ballast (PHLPS DESIGN) (COPPER OR ALUMINUM FOR YOUR CHOICE) - China Electronic Magnetic Ballast, Aluminium Ballast | Made-in-China.com
Swiftair 250w 400w 600w Magnetic Ballast
Master Gear C2-600w Magnetic Ballast (Used with any HPS)
400w Omega Metal Ballast
BALLAST MAGNETIQUE 400W - INDOORFACTORY | Les jardins 2 demain
Omega 400W Pro-V Magnetic Ballast for HID lamps 240V 50Hz Silent Running.
LumenLite 400w HPS Magnetic Light Kit - Metal Ballast - Gardeners Corner