Medium Prefocus Nav Light Bulb - 120V, 40W

These clear, incandescent, medium prefocus bulbs are used in navigation fixtures on vessels at least 65.6 ft (20m) in length.

Prefocus bulbs have bases which ensure that the bulb filament or LED light source is in a specific orientation with respect to the light fixture's lens when seated in the socket.
This is a common requirement for certain vehicle and navigation lights. Prefocus sockets come in several sizes such as Medium and Mogul.

Note these details --
• 0342001CLR 15W bulbs are used in Figs. 1150-1154 all-round white lights on vessels from 20m-50m
• 0342002CLR 25W bulbs are used in Figs. 1150-1154 all-round yellow lights & port/stbd lights on vessels from 20m-50m, as well as white stern lights on vessels over 20m
• 0342003CLR 40W bulbs are used in Figs. 1150-1154 all-round green lights & white masthead lights on vessels from 20m-50m, as well as white all-round lights on vessels over 20m
• 0342004CLR & 0342RS4CLR* 60W bulbs are used in:
Figs. 1150-1154 all-round red lights on vessels from 20m-50m, as well as the port, starboard, white masthead, and green all-round lights on vessels >20m
Figs. 1369-1374 black plastic single lens lights
Figs. 1364-1368 black plastic double lens lights
Figs. 1169-1174 bronze single lens lights
Figs. 1164-1168 bronze double lens lights
Figs. 1111, 0403, 0412, 0454 specialty lights

* Rough Service