China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

Metal halide lamps are a type of HID (High Intensity Discharge) lamp; mercury vapor and high-pressure sodium lamps are also HID lamps. However, mercury vapor and sodium lamps are not typically used in the reef hobby but are widely used in the horticulture industry. The metal halide lamps used in the aquarium hobby are typically characterized.A metal halide lamp’s starting requirements are important because they impact the type of ballast that the lamp requires. Two methods are used to start MH lamps: probe start (standard start) and pulse start. HID lamp (High Intensity Discharge), which means it provides most of its light from the electric arc within a small discharge tube. It is becoming increasingly popular due to its good quality white light and good efficiency. The most prominent use of the MH lamp is in stadiums and sports fields. It is also used widely for parking lots and street lighting in urban areas. Its competitors include the HPS lamp, mercury vapor lamp.

Metal halide ballast provides the proper starting voltage, operating voltage and current to the lamp to initiate and sustain the arc. HID lamps have a negative resistance characteristic, which causes them to draw an increasing amount of current, hence need a current limiting device. The ballast provides these functions. There are several different ballast types used for for HID lighting. Basically, there are two primary distinctions between ballasts: "lag circuit" and "lead circuit" ballasts. The current in lag type ballasts is controlled by an inductive resistance in series with the lamp, whereas in lead type ballasts it current control is provided by both inductive and capacitive resistances in series with the lamp.