The latest innovation in HID lighting has been the development of pulse start technology which saves energy producing more lumens per watt.  It's something that engineers have been working on for a long time and now it's a viable product that is used in warehouses and production plants.  The bulb usually has a lower wattage such as 300, 320 or 350 watts that replace a standard 400 watt metal halide lamp.  So energy savings in these types of situations can be significant.  We supply the entire kit which gives you all the parts you need to replace your ballast for maintenance or energy savings.  We stock Universal HID pulse start metal halide ballasts for any kind of HID source you may have which includes metal halide, high pressure sodium or mercury vapor. HID lamps have been a trusted source of light year after year, and it's the standard for applications like industrial, roadway or security lighting.  For your general information, the high pressure sodium lamp gives off a golden white color and pulse start metal halide illuminates with a white light, that is how you can tell the difference.  You can count on Universal Lighting Technologies for the widest variety of ballasts for all kind of lighting applications.  We're are one of the largest distributors of this product line and we can't think of a better way to maintain your home, municipal or security lighting.  The kits comes with everything you need including core and coil, capacitor, and mounting hardware which will make your job easier.