Sylvania Quicktronic high efficiency QHE electronic T8HO PROStart® high output normal ballast factor operates the family of T8HO lamps at high efficiency which increases light levels while optimizing system performance. This ballast system is the ideal replacement for existing T12HO applications and HID systems. Programmed rapid start QHE T8HO PROStart® extends lamp life which is ideal for applications where long lamp life is desired to reduce maintenance cost or for use with occupancy sensors. This ballast design provides the flexibility to operate as 2-lamp or 1-lamp system, allowing for an additional 50% reduction in inventory. The T8HO PSN system "High ambient Temperature" is specifically designed for those applications where the ballast is subjected to higher ambient temperatures, such as high bays in industrial installations. New 90degC case temperature and -20 deg F/-29 deg C starting rating makes this ballast the ideal T8HO system for higher temperature applications.