Lamps
Lamps Navigation
Lamps Navigation is a group of 12 IMPA-coded items (codes 790401–790416) under Lamps in the Electrical Equipment section (IMPA 79). All of them are priced per piece.
Buying guide
Navigation lamps are the bulbs inside the ship’s navigation lanterns — masthead, sidelights, sternlight, towing and all-round lights. The IMPA group lists them by cap (E-26 screw or B-22 bayonet), supply voltage (24 V, 110–115 V, 220 V) and wattage (40 W or 60 W).
They are raised by the electrical officer or the navigating officer responsible for the lights, typically to keep the spare-bulb stock that every lantern needs; a navigation light that fails at night must be restored at once.
How to specify it
State the cap, the voltage and the wattage together, and copy them from the lantern’s own nameplate rather than from the failed bulb: the same cap is made for several voltages, and a lower-wattage lamp may not give the luminous intensity the lantern was approved for.
COLREG ties each prescribed light to a minimum visible range, and Annex I section 8 converts that range into a minimum luminous intensity in candelas (for example 94 cd for 6 miles, 12 cd for 3 miles). The lamp is part of what delivers that intensity, so order the type the lantern maker specifies, or ask the supplier to confirm it is the approved replacement.[1]
Rules and certificates
Rule 22 sets minimum ranges: on vessels of 50 m or more in length, a masthead light 6 miles and a sidelight, sternlight, towing light and all-round light 3 miles; on vessels of 12 m to under 50 m, a masthead light 5 miles (3 miles under 20 m) and the others 2 miles.[1]
Annex I section 8 gives the intensity formula I = 3.43 × 10⁶ × T × D² × K⁻ᴰ with K = 0.8, and section 14 requires the construction and installation of lights to be to the satisfaction of the flag State’s authority — which is why a lantern’s approval relates to the lamp it was tested with.[1]
Questions buyers ask
- Can I fit an LED bulb in an existing navigation lantern?
- Not on your own authority. COLREG Annex I section 14 leaves the construction and installation of lights to the flag State, and the lantern was approved to deliver a set intensity; check with the lantern maker or class before changing lamp type.
- E-26 or B-22 — how do I know which cap I need?
- E-26 is a 26 mm screw cap and B-22 a 22 mm bayonet cap. Look at the lampholder or the lantern nameplate; the two are not interchangeable.
Published by Sherif Awad, founder of GeoMarineHub — in ship supply since 1990, a family business since 1981 (45 years). Last checked .
At a glance
Part of Electrical Equipment (IMPA section 79): Lamps, cable, switches, fuses, batteries, connectors, marine lighting fittings and meters.
It is one of 11 groups under Lamps; the others include Emergency Battery Lamps, LED Lamps, Lamps Clear B-22, Lamps Clear E-26, Lamps Clear Mogul Screw E-39 and 5 more.
Post the ones you need as a requirement and verified suppliers activated at your port bid on them — sealed, so nobody sees another bid.
- Items
- 12
- IMPA codes
- 790401–790416
- Priced
- per piece
Items
| IMPA | Item | Unit |
|---|---|---|
| 790401 | LAMP NAVIGATION E-26, 24V 40W | PCS |
| 790402 | LAMP NAVIGATION E-26, 24V 60W | PCS |
| 790403 | LAMP NAVIGATION E-26, 110-115V 40W | PCS |
| 790404 | LAMP NAVIGATION E-26, 110-115V 60W | PCS |
| 790405 | LAMP NAVIGATION E-26, 220V 40W | PCS |
| 790406 | LAMP NAVIGATION E-26, 220V 60W | PCS |
| 790411 | LAMP NAVIGATION B-22, 24V 40W | PCS |
| 790412 | LAMP NAVIGATION B-22, 24V 60W | PCS |
| 790413 | LAMP NAVIGATION B-22, 110-115V 40W | PCS |
| 790414 | LAMP NAVIGATION B-22, 110-115V 60W | PCS |
| 790415 | LAMP NAVIGATION B-22, 220V 40W | PCS |
| 790416 | LAMP NAVIGATION B-22, 220V 60W | PCS |
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