Sealite SL23/SL24 3-5nm+ Self-Contained Lanterns

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Sealite SL23/SL24 3-5nm+ Self-Contained Lanterns

For the latest information on prices and availability please contact us on: (800) 596 7245 or

Sealite’s 3–5nm+ lanterns represent a traditional approach to marine navigation, combined with the advantages of LED technology.

The internal 20 LED flasher unit is interchangeable between lanterns, allowing the operator to replace the flasher unit with another colour at any stage of the product’s life. The 20 LED flasher unit is also equipped with 2 rotary switches, allowing the user to change the flash characteristics of the light at any stage.

An easy DIP switch arrangement means the light can be set to any of 4 intensity settings – for differing duty cycles and applications.

The SL23 and SL24 model lanterns are the workhorse of the self-contained lantern range, and are specifically designed to operate reliably in a range of low sunlight regions, or as steady-on lights.

The large 7.5Ah battery provides 20 day autonomy, and the 10watt solar module(s) provide sufficient charge in all seasons.

The lanterns are used extensively by marine departments throughout Canada, Britain, Europe and the United States.

The following downloads are availableDownload
Product Specifications[ download 1.7 MB ]
Installation Manual[ download 1.4 MB ]

Features of the Sealite SL23-SL24

  • LED lens & Sealite's 360º Omnidirectional LED Reflector - increasing the intensity & uniformity of the horizontal light output
  • 20 ultra-high intensity LEDs
  • Adjustable 5watt or 10watt solar module(s) angled to maximise solar collection
  • User-replaceable 7.5Ah SLA battery in 7-stage powder-coated aluminium housing
  • Bird deterrent spike
  • Available with optional 200mm OD mounting plate (MC/04)

Advantages of the Sealite SL23-SL24

  • Impact resistant housing
  • >20 day autonomy
  • Interchangeable 20 LED flasher unit & replaceable lens assembly enables user to swap light colours
  • 256 IALA flash patterns & 4 intensity settings, user-adjustable without the need for external devices
  • Tempered glass solar modules for peak efficiency
  • Full 3 year warranty
Light Characteristics
Light Source20 ultra-high intensity LEDs
Available Flash ColorsRed White Yellow Blue Green
Maximum Available IntensityR- 53.6cd G- 94cd W- 111cd Y- 55.6cd
Visible Range3-5nm +
Horizontal Output360 degrees
Vertical Divergence9 degrees
Reflector TypeOmnidirectional 360° LED Reflector (US Pat. No. 6,667,582. AU Pat. No. 778,918)
Available Flash CharacteristicsUp to 256 IALA recommended (user adjustable)
Intensity AdjustmentsAdjustable in 25% increments
LED Life Expectancy>100,000 hours
Electrical Characteristics
Current DrawRefer to Sealite Power Calculator
Circuit ProtectionIntegrated
Nominal Voltage12v
Autonomy>20 days (14 hour darkness, 12.5% duty cycle)
Temperature Range-40 to 80°C
Solar Characteristics
Solar Module TypeMulticrystalline
OutputSee downloadable PDF
Solar Module Efficiency14%
Charging RegulationMicroprocessor controlled
Power Supply
Battery TypeSLA (Sealed Lead Acid)
Battery Capacity7.5Ah
Nominal Voltage12v
Battery Service LifeAverage 5 years
Physical Characteristics - Lights
Body Material7-stage powder-coated aluminium
Lens MaterialLEXAN® Polycarbonate - UV-stabilised
Lens Diameter (mm/inches)107 / 4 1/4
Lens DesignExternal optics with interior flute design
Mounting50mm OD pole
Height (mm/inches)See downloadable PDF
Width (mm/inches)See downloadable PDF
Mass (Kg/lbs)See downloadable PDF
CEEN61000-6-3:1997, EN61000-6-1:1997
Quality AssuranceISO9001:2008
Intellectual Property
PatentsUS Pat. No. 6,667,582. AU Pat. No. 778,918
TrademarksSEALITE® is a registered trademark of Sealite Pty Ltd
WarrantyFull 3 years


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