Fenix SD20 Diving Light

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Features Cree XM-L2 U2 white & XQ-E red LEDs
1000 Max lumen output
Uses 4 x CR123 / 2 x 18650 battery



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Thursday 25th February 2021


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Fenix SD20 is specially designed for diving activities, but also serves as a general purpose torch thanks to built-in overheat protection that controls the flashlights body temperature out of the water. This diving flashlight delivers integrated 1000-lumen white light and 105-lumen red light beams. The rotating magnetic ring mode selector is easy and convenient to operate with one hand. 100-metre waterproofing frees your underwater exploration with a large safety margin.

Fenix SD20 performance:

White light: High: 1000 lumens (3h, 172m beam), Low: 400 lumens (7h 30 min, 108m beam)
Red light: 105 lumens (8h)

Battery Level Indicator
When rotating the magnetic ring to the battery level output, there are three states: red light constant-on displays sufficient power level, red light slow flash displays poor battery level, red light quick flash displays critical battery level.

Low-voltage Protection
1. When the light works at High output, if the detected voltage is lower than the preset voltage of 6.2V, the output will automatically downshift to 400 Lumens.
2. When the light works at High or Low output, if the detected voltage is lower than the preset voltage of 6.0V, the output will automatically downshift to 100 Lumens.
3. When the light works at the Red light mode, if the detected voltage is lower than the preset voltage of 6.0V, the output will automatically downshift to 25 Lumens.

Intelligent Over-heat Protection
The light will accumulate a lot of heat when it is working at High output. When the light is overheated internally up to 65c or above, the flashlight will automatically adjust the output to prevent the light from overheating.

For full product details please refer to the user manual in the images area.


Brand Fenix
Model SD20 Diving Light
Batteries CR123 x 4 / 18650 x 2
Additional Battery Type N/A
Lamp Type Cree XM-L2 U2 white and XQ-E Red LEDs
Output/Runtime High: 1000 lumens (3 hrs), Low: 400 lumens (7 hrs 30 mins), Red: 105 lumens (8 hrs)
Strobe/SOS N/A
Max Beam Distance 172m
Reflector Smooth
Lens Type Toughened ultra-clear glass lens with anti-reflective coating
Switch Type Rotating magnetic ring
Construction Made from durable aircraft-grade aluminum
Finish Premium Type III hard-anodized anti-abrasive finish
Tail Stand No
Pocket Clip No
Waterproofing IPX-8, 100m depth
Dimensions 208 mm (Length) × 26 mm (Body Diameter) × 40 mm (Head Diameter)
Weight 245-gram weight (excluding batteries)
Further Info

Battery connector allows the use of two flat top batteries

SD20 User Manual

Retail packaged Fenix SD20 Diving Light
Battery connector (for flat top cells)
Spare O-ring
Instruction manual
Warranty card
4 x CR123 battery (retail customers only)

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