3. Instant-starting, hot-cathode –The lamp cathode in the instant-start is not pre-heated. Sufficient voltage is applied across the cathodes to create an instantaneous arc. As in preheat circuit; the cathodes are heated during lamp operation by the arc. The instant-start lamp require single-pin bases, are generally called slim line lamps. 4. Hot-cathode, rapid-start–These are similar in construction to the preheat lamps; the basic difference is in the circuitry. This circuit eliminates the delay inherent in preheat circuits by keeping the lamp cathodes constantly energized (preheated). When the lamp circuit is energized, the arc is struck immediately. No external starter is required. Because of this similarity of operation, rapid start lamps will operate satisfactorily in a preheat circuit. The reverse is not true, because preheat requires more current to heat the cathode than the rapid-start ballast provide
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3. Instant-starting, hot-cathode –The lamp cathode in the instant-start is not pre-heated. Sufficient voltage is applied across the cathodes to create an instantaneous arc. As in preheat circuit; the cathodes are heated during lamp operation by the arc. The instant-start lamp require single-pin bases, are generally called slim line lamps. 4. Hot-cathode, rapid-start–These are similar in construction to the preheat lamps; the basic difference is in the circuitry. This circuit eliminates the delay inherent in preheat circuits by keeping the lamp cathodes constantly energized (preheated). When the lamp circuit is energized, the arc is struck immediately. No external starter is required. Because of this similarity of operation, rapid start lamps will operate satisfactorily in a preheat circuit. The reverse is not true, because preheat requires more current to heat the cathode than the rapid-start ballast provide