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MARINE SIGNAL LAMPS
S‐8 and S‐11 single contact, pre‐focused marine signal lamps may be used on all PMAPI standard flasher/lamp changer units. Their rated life is 1000 hours. Their voltage and ampere ratings are listed in the
table below.
INCANDESCENCE PERIOD OF ELECTRIC LAMPS
When calculating the effective intensity of a rhythmic electric light eclipsed by opening the circuit of a filament lamp, the light duration to be used is the period during which the circuit is closed, less the time taken for the filament to reach 90 per cent of full intensity. Nigrescence is assumed to be instantaneous at extreme range. The allowance can be read directly from the graph when the circuit has negligible resistance compared with the resistance of the hot
filament.
