Definitions for "Rapid Start"
A fluorescent system that does not use a "starter." (See "Preheat.") Except for "slimline" lamps, all modern fixtures using 40-watt and higher lamps are equipped with rapid-start ballasts. The most popular fluorescent lamp/ballast combination used today.
An obsolete fluorescent lamp/ballast combination, requiring RS argon filled lamps. The ballast preheats lamp cathodes to start the lamp.
A fluorescent system, which does not require starters and usually requires 1 to 2 seconds to start. Current flows continuously through the electrodes keeping them hot and electron emissive.