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 Source 20 ultra-high intensity LEDs
Available Flash Colors Red White Yellow Blue Green
Maximum Available Intensity R- 53.6cd G- 94cd W- 111cd Y- 55.6cd
Visible Range 3-5nm +
Horizontal Output 360 degrees
Vertical Divergence 9 degrees
Reflector Type Omnidirectional 360° LED Reflector (US Pat. No. 6,667,582. AU Pat. No. 778,918)
Available Flash Characteristics Up to 256 IALA recommended (user adjustable)
Intensity Adjustments Adjustable in 25% increments
LED Life Expectancy >100,000 hours
Electrical Characteristics
Current Draw Refer to Sealite Power Calculator
Circuit Protection Integrated
Nominal Voltage 12v
Autonomy >20 days (14 hour darkness, 12.5% duty cycle)
Temperature Range -40 to 80°C
Solar Characteristics
Solar Module Type Multicrystalline
Output See downloadable PDF
Solar Module Efficiency 14%
Charging Regulation Microprocessor controlled
Power Supply
Battery Type SLA (Sealed Lead Acid)
Battery Capacity 7.5Ah
Nominal Voltage 12v
Battery Service Life Average 5 years
Physical Characteristics - Lights
Body Material 7-stage powder-coated aluminium
Lens Material LEXAN® Polycarbonate - UV-stabilised
Lens Diameter (mm/inches) 107 / 4 1/4
Lens Design External optics with interior flute design
Mounting 50mm OD pole
Height (mm/inches) See downloadable PDF
Width (mm/inches) See downloadable PDF
Mass (Kg/lbs) See downloadable PDF
CE EN61000-6-3:1997, EN61000-6-1:1997
Quality Assurance ISO9001:2008
Intellectual Property
Patents US Pat. No. 6,667,582. AU Pat. No. 778,918
Trademarks SEALITE® is a registered trademark of Sealite Pty Ltd
Warranty Full 3 years


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