Section 281.1233. Navigation lights; intensity standards; placement; screening.

(1) Navigation lights shall be of sufficient   intensity so that the  candlepower outside  the  lens  is   not  less than  that  amount corresponding to the required  distance of visibility as   indicated   in table 1.

TABLE 1

Distance of Visibility In Nautical        Candlepower Miles
1	1.0
2	5.5
3	17.6
5	100.0

(2)    As an aid in complying with this rule, the standard double contact bayonet candelabra base lamps listed in table 2 are recommended for motorboats having 6- to 32-volt electrical systems.

TABLE 2

Distance of Visibility in Nautical Miles	Color	Lamp Number for Certain Voltage Systems
		With Fresnel Lens			Without Fresnel Lens
		6	12	32	6	12	32
1	Red	82	90	1,226	1,130	1,142	1,230
1	Green	88	94	1,228	—	—	—
2	White	64	68	1,224	82	90	1,226
3	White	82	90	1,226	1,130	1,142	1,230

(3)   As an aid in complying with this rule, the incandescent lamps listed in table 3 are recommended for vessels having 115 volt electrical systems.

TABLE 3

Distance of Visibility in Nautical Miles	Color	Wattage
		With Fresnel Lens	Without Fresnel Lens
1	Red	—	25
1	Green	25	50
2	White	—	15
2	Amber	—	25
2	Red	40	100
2	Green	75	200
3	White	—	25

3	Amber	25	75
5	White	40	100

(4)   The light intensity standards of this rule shall apply to new navigation lights installed and replacements of existing  lights   made  on and after January 1, 1973.

(5)   Navigation lights required by these rules shall  be  placed  high enough that their light will not be obstructed by persons or parts of the boat or its equipment and shall be screened as indicated in figure 1.

Figure for 281.1233

History: 1979 AC.