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

Both high pressure sodium and metal halide lamps are considered HID (high intensity discharge). These bulbs, which are mostly used in outdoor settings, offer different amounts of light output and operate in different color spectrums. MH produces more sky glow, lumen for lumen, than HPS for the same quantity of radiant energy from each source, due to higher blue light component and the Rayleigh scatter effect.

MH lamps contain significantly more mercury than HPS lamps. For example, a 250W MH lamp contains about 38 mg of mercury vs. about 15 mg for an HPS lamp of the same wattage. Mercury is a potent neuro-toxin that persists indefinitely in the environment.Whenever MH is within close proximity to housing units, MH lighting will only increase the health risk.
MH lamps are great for growing plants indoors. Since these lamps are more like natural sunlight, they are the best option for people who want to be able to grow plants indoors in the area that they are lighting up. This is particularly true if you are trying to grow vegetative plants as opposed to flowering plants.
Metal halide lamps, a member of the high-intensity discharge (HID) family of lamps, produce high light output for their size, making them a compact, powerful, and efficient light source. By adding rare earth metal salts to the mercury vapor lamp, improved luminous efficacy and light color is obtained. Originally created in the late 1960s for industrial use, metal halide lamps are now available in numerous sizes and configurations for commercial and residential applications.

Like most HID lamps, metal halide lamps operate under high pressure and temperature, and require special fixtures as well as ballast to operate safely.

Since the lamp is small compared to a fluorescent lamp or incandescent lamp of the same light level, relatively small reflective luminaires can be used to direct the light for different applications (flood lighting outdoors, or lighting for warehouses or industrial buildings).