Philips Advance Ballast

Philips Advance Ballast

Low Pressure Sodium Philips Advance Ballast as they have neither a starting electrode nor an ignitor, low pressure sodium lamps require an open circuit voltage approximately three to seven times the lamp voltage to start and sustain the lamp.

Gas discharge lamps have a negative resistance characteristic which causes them to draw an increasing amount of current leading to immediate lamp failure if operated directly from the power line. The ballast, therefore, is utilized to limit the current to the correct level for proper operation of the lamp.
Ballast factor is defined as the ratio of light output produced by a lamp operating on a commercial ballast versus the lamp’ s rated light output. Philips Advance HID ballasts have a nominal ballast factor of 1.0, thus providing full light output.
HID lamps take several minutes to warm-up and reach full lumen output. Additionally, an interruption in the input power or a sudden voltage drop may cause the arc to extinguish. A lamp that is hot will not restart immediately. Before the lamp will relight, it must cool sufficiently to reduce the vapor pressure within the arc tube to a point where the arc will restrike. The approximate warmup and restriking times of the HID lamp groups