Finally, a true one-to-one, rough service LED replacement for 120/240V AC 60W, Medium Prefocus P28S base incandescent bulbs for 6 nautical mile navigation lights. 
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. 
This LED bulb is specially designed as a direct replacement for the 120/240V medium prefocus bulbs used in Perko and Aqua Signal navigation lights for vessels over 20 meters. See below for specifics. 
This high-quality, long lasting LED bulb eliminates having to frequently replace short service life incandescent bulbs. 
Developed by Dr. LED at the request of the USCG to improve the reliability of their navigation lights that use P28S bulbs, and to eliminate the often hazardous task of having to replace incandescent P28S bulbs while underway. This bulb has also been chosen by the US Navy for use in their P28S bulb navigation lights. 
It is the only USCG certified after-market replacement P28S LED bulb currently available. 

• High-power LED, 6 NM certified visibility in clear lens fixtures, 3 NM in fixtures with colored lenses  
• Long service life increases vessel safety and reliability 
• Shock-resistant, and ultra-rugged with no filament to break or burn out 
• Only draws 8 Watts of power (60W incandescent equivalent); 880 lumens 
• Replaces Perko 120/240V AC 60W Fig. 0342004CLR and 0342RSCLR (Rough Service) incandescent bulbs 
• Replaces Aqua Signal 110/230V AC 60W 90400172 and 90400173 incandescent bulbs 
• Lead and mercury free; no UV output 
• Dimensions: 119mm (4.7") tall x 38mm (1.5") diameter 
• Certified to USCG COLREG 1972 (IMO) and UL1104:1998 standards 
• Designed in the USA 

Replaces Aqua Signal bulbs: 
90400172 (old number 90172-4) - 110V 60W 
90400173 (old number 90173-4) - 230V 65W 

The P28S Polar Star LED bulb is suitable as an upgrade for these Aqua Signal incandescent navigation light fixtures for vessels over 20 meters in length (when wired for 120V AC or 220V AC) : 
• Black plastic housing, single lens - Series 70 
• Black plastic housing, double lens - Series 70D and Series 70M 

Replaces Perko bulbs: 
0342004CLR - 120V 60W 
0342RS4CLR - 120V 60W Rough Service 
0342220CLR - 240V 65W 

The P28S Polar Star LED bulb is suitable as an upgrade for these Perko incandescent navigation light fixtures for vessels over 20 meters in length (when wired for 120V AC or 220V AC) : 
• Black plastic housing, single lens - Figures 1369 - 1374 
• Black plastic housing, double lens - Figures 1364 - 1368 
• Bronze housing, single lens - Figures 1169 - 1174 
• Bronze housing, double lens - Figures 1164 - 1168 
• Galvanized sheet metal housing - Figures 1150 - 1154 
• Specialty Lights - Figures 1111, 0403, 0412, 0454

120/240V P28S White Polar Star