Metal Halide lamps are used in sporting stadiums and industrial applications where light quality is important. GE2012-5024 Rev 1 Page 6 HID flood lights exports to EU, Middle east, Russia. New: The three-stage electronic ballast for metal halide lamps of Three-stage electronic ballast for metal halide lamps Since the micro processors are common and cheap in the market, the present invention is advantageous in low production cost and low complexity.The present invention is thus described, and it will be obvious that the same may be varied in many ways. Although circuitry structure of the prior art is similar to the three-state structure according to the present invention, its step-down converter is operated in a discontinuous current mode to lessen running down of switching elements. Advance IMH70DLFM - 70 Watt - Metal Halide Ballast - Pulse Start - 120/277 Volt - ANSI M98 M139 or M143 - Power Factor 90 - Max Temp Rating 85 deg C. $65.37 $ 65 . LOT OF 2 NEW UNIVERSAL M3912CK-6EUN-F METAL HALIDE BALLAST 39W 120VAC. The device comprises a filter and rectification circuit connected to an input voltage source terminal for suppressing electromagnetic disturbances and rectifying an input voltage signal; a step-up converter disposed after the filter and rectification circuit, the step-up converter further comprising a push-pull transistor, a step-up inductor and a rectification diode and a filter capacitor; a step-down converter disposed after the step-up converter, the step-down converter further comprising an inductor, a diode, a capacitor and a transistor switch, the step-down converter controlling the current in the inductor at the boundary of continuity and discontinuity so as to lessen power loss and enhance operation efficiency; a DC-AC converter disposed after the step-down converter for providing an alternating square-wave voltage to a metal halide lamp; an ignition circuit using circuit elements including a step-up transformer and a capacitor to generate an electric voltage up to 3 kilo volts for discharging the metal halide lamp; and a micro processor for controlling the conducting rate of the step-down converter according to the product of output voltage and current of the step-down converter, whereby power regulation can be achieved; The three-stage electronic ballast for metal halide lamps can force the inductor in the step-down converter to operate in a continuous boundary current mode, whereby the peak value of the inductor current will be decreased, and whereby the transistor switch switches under zero current, significantly reducing power loss in switching.The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings.Further, the electronic ballasts for metal halide lamps of the prior art use a power-factor correction circuit comprising a step-up converter for jumping input voltage and correcting the power factor at the same time. The electronic ballast can be added with various protective functions without complex control circuits and sensing elements, thereby becoming a high-quality and low-cost electronic ballast for metal halide lamps.1. PRODUCTS BRIEF: HID lamps require metal halide ballasts or high pressure sodium ballasts for metal halide flood lights & hps flood lights, Magnetic ballasts kits include high pressure sodium ballasts or metal halide ballasts, Ignitor (Starter), Capacitor and HID bulbs. micro processors for specific purposes can be used to operate a step-up converter in the continuous boundary current mode, which can maintain a fixed DC output voltage under large variations in input voltage. The present invention relates to electronic ballasts for metal halide lamps, and more particularly to an electronic ballast for metal halide lamps having a three-stage structure. There are 18 items available. The item you've selected was not added to your cart.