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Underwater Kinetics

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About Underwater Kinetics Sunlight SL4 Dive Light

The SL4 has to be the smallest and brightest 4 "C" cell dive light ever made! It emits a narrow and penetrating beam, which allows you to seek out unique marine life found under ledges. It also works well when attached to protective head gear in technical diving applications. The SL4 is great as a photo spotting light or to illuminate gauges and dive tables. Light fits neatly in a BCD pocket so it's always ready for use with its 5.5 watt high pressure xenon filled lamp. Tough, non-conductive ABS and polycarbonate plastic construction will not corrode, dent or freeze to skin in cold weather, and it comes with an adjustable rubber sleeved lanyard.

The SL4's Xenon lamp produces 113 lumens of brightness with a precision machined aluminum reflector that gives a tight 8° degree beam angle. The light has an 804' (425 meter) beam distance on land. To reduce glare and protect the light, the SL4 comes with a molded rubber bezel cover. The rotary switch is easily activated with the thumb and index finger for single hand operation. The Light is powered by 4 x C"-cell alkaline batteries (included) with a burn time of 4 to 5 hours. The light measures 6.3" x 1.8" x 2.5" (16 x 4.57 x 6.35 cm), weighs 15 oz (425.24 g) and is depth rated to 500' (152.4 meters). The SL4 is available in multiple colors, includes an owner's manual, is proudly made in the USA and is covered by a limited lifetime warranty.

The Underwater Kinetics Sunlight SL4 Dive Light is commonly used for Cave Diving, Close-Up Viewing, Extreme Depths, Night Diving, Professional, Recreational, Safety Backup and more. The Underwater Kinetics Sunlight SL4 Dive Light is most used by customers who consider themselves to be a Advanced, Advanced Diver, Recreational Diver among others. The Underwater Kinetics Sunlight SL4 Dive Light is popular because customers like the following qualities of the Underwater Kinetics Sunlight SL4 Dive Light: Compact, High Intensity, Long Bulb Life, Reliable, Well-Focused.

Warranty Information

This product has a limited lifetime warranty.


Underwater Kinetics Sunlight SL4 Dive Light Features

  • Underwater Kinetics Sunlight SL4 Dive Light
  • Smallest & Brightest 4 "C" Cell Dive Light Ever-Made!
  • Emits Narrow & Penetrating 8° Degree Beam
  • Beam Distance: 804' (425 meter) On Land
  • Great for Attachment to Protective Head Gear in Technical Diving
  • Great for Photo Spotting Light or Illuminate Gauges & Dive Tables
  • Fits Neatly in BCD Pocket
  • 5.5 Watt High Pressure Xenon Filled Lamp
  • Tough, Non-Conductive ABS & Polycarbonate Plastic Construction
  • Will-Not: Corrode, Dent or Freeze to Skin in Cold Weather
  • Adjustable Rubber Sleeved Lanyard
  • Lumens: 113 Lumens of Brightness
  • Precision Machined Aluminum Reflector
  • Molded Rubber Bezel Cover: Reduce Glare & Protect Light
  • Rotary Switch: Easily Activated, Single Hand Operation
  • Power: 4 x C"-Cell Alkaline Batteries (included)
  • Burn Time: 4 to 5 Hours
  • Depth Rating: 500' (152.4 meters)
  • Dimensions: 6.3" x 1.8" x 2.5" (16 x 4.57 x 6.35 cm)
  • Weight: 15oz (425.24g)
  • Available in Multiple Colors
  • Owner's Manual
  • Proudly Made in the USA
  • Limited Lifetime Warranty

Underwater Kinetics Sunlight SL4 Dive Light Customer Reviews Powered by TurnTo®

Review Summary


(based on 34 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Bright and compact

Even if it took some time to clear the order desk, delivery was incredibly fast, got it in Montreal in no time.


Most Liked Negative Review


Not as bright as eLED

Good back-up for the price.

Reviewed by 34 customers

Displaying reviews 1-5

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Bright, compact, reliable


from Pensacola, FL, US

Perfect for slipping in the BC pocket for daytime dives where a light might allow a look into a deep recess. I use this for both primary and backup lights at night, since the bright beam really improves focusing attention on what is hiding on and under the coral or in the wreck.


UK SL4 Junk


from Aspen, CO, US

Upon arriving in Indonesia, dive light was snapped in half between the 2 molded parts, poor resin in construction. Was very disappointed, considering the dive light never made a single dive. Luckily, had a back-up. Used my dive partners light, was the exact same light, & it too was erratic, sometimes it worked & other times it just went out during the night dives, really pissing me off, (while diving with a 40 megapixel camera). What more can be said.......junk.... I'm sending it back ASAP!


I would buy this again


Got this for my 11 year old son. It has a bright and narrow beam and penetrates good. We used it night diving in the pool and in the lake with low vis and have not had any problems with it. Good light for the money. also would make a good spare for night diving.


Does not honor warranty


The company refuses to allow you to use your warranty if the reflector comes off. The light, overall, is poorly made. Even the seals won't stay in place. A $5 flashlight would be more reliable then this flashlight. I recommend to use another brand because. Their warranty is only as good as their word.


Great Light


I own a couple of these. Good, solid and inexpensive light.

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Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Why Did You Choose This?
Blaine P  Use this light as primary and backup, ordered another for a friend.
BILL H B  Heard it was a good light
ENRIQUE Z  Best small light on the market ...
LINDA H  This is the brightest small light I have used. It fits easily into my vest pocket but provides an excellent strong beam of light for looking in crevices and holes. Good night dive back-up light.
HARRY C  good price/quality
CHARLES H  Small, good enoght light for looking in holes and small overheads. I use if for spearfishing.
FAREED H  Cost. Needed a backup light.
ALLEN S  This is an awful lot of illumination in a small package. It fits nicely into a pouch on the waist belt or a thigh pocket.
WILLIAM S  Use it regularly. Dependable and not too bulky.
DAMON H  This was a good price for a back-up light.
JENNIFER S  Best long lastingback-up flashlight. I had/used my old one for about 20 years
tom s  can i get a new light bulb for my sl4 flashlight ?
JOHN W  Yes you can buy one at most dive shops?
APRIL K  Yes, I replaced mine a couple of dive seasons back.
Shrew J  Is this LED or Xenon lights?
Steve S  This is a 5.5 Watt Xenon bulb.
JIMMY M  The SL4 is a xenon bulb. The good one is the SL4eLed or something like that--at about $75-90.
APRIL K  Probably xenon. It is not LED for sure. It is bright and works well. Carry it in a BC pocket as a general purpose/backup light.
DIMITRIOS M  It's Xenon. Look for SL4 eLED L1 for the LED. I recommend the LEDs if you can afford it, batteries last forever.
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