Perko Bulb Fig. 71 and Fig. 72 LED Replacement Bulbs. Festoon marine navigation LED replacement bulbs for Perko, Hella, Aqua Signal etc. lights. Replaces 36mm, 39mm, 41mm, and 44mm pointed festoon bulbs. 12V & 24V 36-44mm 2nm marine festoon LED bulbs for Aqua Signal series 25, Perko, Hella, Forespar etc. navigation lights.