Description

The ACR C-Light H2O LED Water-Activated Light 3962.1 is a compact, rugged personal emergency light designed for life jackets, inflatable PFDs, backpacks, and marine safety kits. This H2O model can be activated manually with the ON/OFF button or automatically when armed and immersed in water. It uses a steady-on 20 lumen white LED and is built with a waterproof, impact-resistant housing for reliable low-light emergency location assistance.

Key Features

• ACR part number 3962.1 — C-Light H2O, carded version
• Water-activated model with manual ON/OFF button operation
• Automatic activation when armed and immersed in water
• Steady-on 20 lumen white LED
• Typical operating life of more than 30 hours at 30°C
• Minimum operating performance of more than 20 hours at -1°C
• Waterproof tested for 24 hours at 3.3 ft / 1 m
• Uses 2 AA batteries, sold separately
• Size: 5.56″ x 1.38″ x 1.2″ / 14.1 x 3.5 x 3.0 cm
• Weight: 1.4 oz / 40 g without batteries
• Reverse battery protection
• Carded version includes PFD clip, lanyard, and Velcro strap
• Certifications include USCG/SOLAS, CE, and Transport Canada

Intended Use

The C-Light H2O is intended for emergency visual location assistance on life jackets, inflatable PFDs, vessel safety kits, ditch bags, paddling gear, backpacks, and personal survival equipment. Its water-activation function makes it especially useful for PFD installations where the light may need to activate automatically after water entry.

Fitment Notice

This is the water-activated C-Light H2O 3962.1. For manual-only steady light use, the related C-Light model is 3963.1. Always confirm the required approval standard for your vessel, operating area, and onboard safety-equipment list before replacing or adding emergency lighting.

When This Product Needs Replacement

Replace the light if the housing is cracked, the ON/OFF button becomes unreliable, the water-activation function fails testing, the battery compartment shows corrosion, the light output is weak, or the unit no longer meets required onboard safety standards. Batteries should be inspected regularly and replaced before expiry, seasonal launch, offshore trips, or long-term storage.

Installation Notes

Attach the C-Light H2O to a compatible life jacket, inflatable PFD, backpack strap, or emergency kit using the included mounting accessories. The carded version includes a PFD clip, lanyard, and Velcro strap, allowing flexible mounting on webbing, straps, or an inflatable life jacket’s oral inflation tube. Install fresh AA batteries, verify the battery door is secure, and test both manual and water-activation operation before placing the light into service.

Alternate/Superseded Part Numbers

Related ACR C-Light references include:

• 3962.1 — C-Light H2O, carded water-activated version
• 3962 — C-Light H2O, bulk water-activated version
• 3963.1 — C-Light, carded manual version
• 3963 — C-Light, bulk manual version

Parts Desk Insight

The main reason to choose 3962.1 is automatic activation. For PFD and life jacket setups, water activation can be the deciding feature because the light can begin working even if the wearer cannot turn it on manually right away.

Shipping: Ships within 3 days for fast Canada wide shipping.