IceCap's VHO Model 660 electronic fluorescent ballast. From the company that transformed VHO lighting from heavy, hot, noisy, lamp destroying beasts to a 1 1/2 lb., cool running, silent, high frequency devise that extends lamp life while using 1/3 less electricity. The professional's choice in VHO. Each ballast lights up to 16 lamp feet (1 - 4 lamps) or up to four 96-watt PC lamps. Also lights NO lamps at over 2 X normal output. Three year warranty, repairable, made in the USA with a detachable six-foot harness