ACR 3947 SM-3 SOLAS Lifebuoy Marker LightView all products in Man Overboard & Rescue lights #:  16180
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ACR 3947 SM-3 SOLAS Lifebuoy Marker Light

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Includes a 2" band of SOLAS reflective tape applied at the factory for additional visibility in the water. This durable LED marker light is an excellent choice for vessels needing to meet SOLAS Type Approved carriage requirements for lifebuoy self-igniting lights.
More Details...   #16180
MFG Part#:   3947
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ACR 3947 SM-3 SOLAS Lifebuoy Marker Light

The SM-3 SOLAS lifebuoy light with a minimum light intensity of 3 candelas throughout its entire operating life, this high intensity LED strobe marks a crew-overboard site with each brilliant flash.

It automatically rights itself and activates when in the water, ensuring that activation is never an issue that a crew member in distress needs to worry about.

The SM-3 operates on 2 AA Lithium batteries, and the batteries are user-replaceable, allowing the potential for a longer product life than the many disposable lifebuoy lights on the market.

The supplied mounting bracket holds the SM-3 secure in the roughest of conditions but it is still readily accessible when needed in an emergency.

Additionally, while the SM-3 and its bracket are significantly smaller than the SM-2 counterparts, the SM-3 bracket conveniently maintains the same mounting hole pattern as the SM-2, allowing for easy retrofit with no additional adapter plate required.

The SM-3 is USCG/MED/SOLAS approved for use worldwide. This durable LED marker light, therefore, provides an excellent option for vessels needing to meet USCG and SOLAS carriage requirements for lifebuoy self-igniting lights.

As per USCG and SOLAS requirements for passenger and cargo vessels, at least one-half of the total number of lifebuoys on the vessel must be fitted with a self-igniting light. Minimum carriage requirements are based on the vessel's length and can range from a minimum of four to a minimum of fifteen lifebuoys with self-igniting lights per vessel.

Rugged design leads to greater flexibility of use. While the SOLAS approval only calls for a 30-meter drop test, the SM-3 has been drop tested to 76 meters.

This makes the SM-3 a versatile option for use on various platforms or vessels of different sizes.

With its easily replaceable Lithium AA battery power source, the SM-3 will give years of service and be ready when called upon.

  • SOLAS / MED Approved
  • Bright light in all directions (360° visibility)
  • UV resistant polycarbonate case
  • Lightweight and compact in size
  • Easy bracket installation The bracket is included and maintains the same hole pattern as SM-2 for easy retrofit
  • Automatically rights itself and activates when in the water
  • High intensity LED strobe
  • Floats upright in all conditions
  • Minimum 40 hours continuous operating life at 30° C (86° F) or over 24 hours at -1°C (30°F)
  • User-Replaceable AA Energizer L91 Lithium Batteries (Not Included)

  ACR SM-3 Specification Sheet

  ACR SM-3 MED SOLAS Type Approval Module D Valid till October 11 2024

  ACR SM-3 MED Type Approval Module B Valid till April 7 2027

  ACR SM-3 USCG Certificate of Approval 161_010_30_0


  • Name: SM-3 Lifebuoy Self-Igniting Marker Light
  • Product Description: Strobing Crew-Overboard Marker Light
  • Model Number: SM-3
  • Application Commercial maritime applications including; petro-marine, workboats, cruise liners, tugs and workboats, supply vessels, cargo vessels, passenger vessels, fishing charters, etc.
  • Size:
    • 9.9" (253 mm) Length
    • 2.2" (56 mm) Diameter
  • Weight:
    • 0.66 lbs (300 g) Light Only
    • 0.71 lbs (330 g) Light with Batteries
    • 0.90 lbs (406 g) Light with Batteries & Bracket
  • Batteries: 2 AA Lithium Batteries (L91) / User Replaceable (Not Included)
  • Material: UV Resistant Polycarbonate
  • Colour: International Safety Orange
  • Activation: Automatic gravity switch
  • Operation: Throw SM-3 overboard or turn upright and the strobe light will automatically begin to flash
  • Light Intensity: Minimum of 3 candelas per flash in all directions of the upper hemisphere
  • Visibility: 360° visibility
  • Flash Rate: 50-70 times per minute
  • Buoyant: Yes
  • Lamp: Ultra-Bright LED
  • Operational Life:
    • 40 hours over 3 cd at 30°C (86°F)
    • 24 hours over 3 cd at -1°C (30°F)
  • Drop Test: Drop tested to 76 meters (USCG/SOLAS/MED only call for 30 meters)
  • Warranty: 1 year
  • Approvals: USCG / MED / SOLAS
  • Mounting Bracket: UV resistant polycarbonate bracket included (Same mounting hole pattern as previous SM-2 Model for easy retrofit.)

Share your knowledge of this product with other customers... Be the first to review this product Shipping FAQ

Q. Do you offer Free Shipping?
A. We have free ground shipping via UPS or Canada Post within Canada on most orders of $99 or more (pre-tax).

Q. What do you mean by most orders?
A. Some items are exempt from this offer and are indicated on the product page. Exempt items are usually bulky or heavy items such as buoys. Over 98% of the items on qualify for the free shipping offer.
To see what your shipping charge (if any) will be you can add the item(s) and quantities to the shopping cart and you will see a shipping cost calculator

Q. Where do you ship from?
A. We ship from Halifax, NS

Q. What is the delivery time?
A.  NS, NB, PE: 1 - 2 business days,
      ON, QC, NL: 2- 4 business days
      MB, SK, AB: 4-5 business days
      BC: 5-7 business days
When your order ships you will be emailed a tracking number which will give you the scheduled delivery date

Q. Do you offer Express Shipping?
A. We offer Express Shipping on some orders depending on the items ordered and the delivery address. If Express shipping is available for your order you will see the option on the checkout page. If you do not see the Express option and you want Express shipping please send an email and we will provide you with a quote (

Q. Do you require a signature on delivery?
A. We sometimes add a signature requirement especially if it is a high value package

Please Note:
Very Remote areas are exempt from Free Shipping offer. These are typically remote northern areas. Nunavut as well as many parts of the Yukon and NWT are exempt from free shipping

Money Back Guarantee
Guarantee You may return your purchase to us (with a return authorization number - use this form) within 30 days and we will refund the purchase price of the product. Items which are cut to order (rope, wire etc), software, chart cards and printed materials (paper charts, books) are not returnable.

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