Patent Number: 6,166,495

Title: Square wave ballast for mercury free arc lamp

Abstract: A ballast for a mercury-free, metal halide arc lamp having a quartz or fused silica envelope. The ballast provides a square-wave voltage, which substantially reduces or eliminates the re-ignition voltage in the mercury-free, metal halide arc lamp. The ballast reverses the voltage polarity, and reestablishes the arc current in the opposite direction, before the free halogen in the envelope can quench the arc.

Inventors: Newell; P. Bruce (Carlisle, MA), Brates; Nanu (Malden, MA)

Assignee: Osram Sylvania Inc.

International Classification: H05B 41/288 (20060101); H05B 41/292 (20060101); H05B 41/28 (20060101); H05B 037/00 ()

Expiration Date: 12/26/2017