High Pressure Sodium Ignitors / Capacitors
Mercury Vapor Metal Halide

High Pressure Sodium
High-pressure sodium lamps work by creating an electric arc through vaporized sodium metal. Other materials and gases are used to help start the lamp or control its color. High-pressure lamps are efficient lamps, very powerful lamps for the use of large areas, there is a warm up time of 5-10 minutes it restarts immediately if there is a brownout and the lumen output does not drop with age.

Ignitors / Capacitors
An ignitor is a device for igniting a fuel mixture in an engine and it is a device for causing an electric arc. A capacitor is a device that is used to store an electric charge that consists of one or more pairs of conductors separated by an insulator.

Mercury Vapor
A mercury-vapor lamp is a gas discharge lamp that uses an electric arc through vaporized mercury to produce light. The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. The outer bulb may be clear or coated with a phosphor; in either case, the outer bulb provides thermal insulation, protection from the ultraviolet radiation the light produces, and a convenient mounting for the fused quartz arc tube.

Metal Halide
A metal-halide lamp is an electric lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides. It is a type of high-intensity discharge (HID) gas discharge lamp. Metal-halide lamps contain additional metal halide compounds in the quartz arc tube, which improve the efficiency and color rendition of the light.