Advanced Lighting Products

StenLight S7 Fact Sheet

The StenLight S7 is a high powered LED lamp designed especially for the hostile caving environment. Mud, water, and shock-resistant, the S7 was designed by cavers to address the shortcomings of conventional cave lamps.

Key Features:

The StenLight S7 uses a high-efficiency all-analog control circuit that regulates LED current in all brightness modes, and limits itself to a safe temperature by reducing LED current when necessary. The magnetically controlled switch has 5 clearly-defined positions that are separated to avoid accidentally switching the unit off. The switch has no moving parts inside the lamp body, and is fail-safe – if the switch is destroyed or the magnet lost, the unit defaults to the LOW setting, which is still bright enough for you to find your way.


Brightness Settings Summary


Power Consumption

Run Time1

Light Output, min. lumens2


200 microwatts 3

20 months 4



100 milliwatts

> 3 days



600 milliwatts

> 24 hours



2 watts

7 to 8 hours


thermal limiting

4 watts 5

3 to 5 Hours


no limiting

7 watts 5

2 Hours


Technical Notes:

  1. based on the StenLight (LG723) 2.3 AH 7.4V lithium ion battery, fully charged
  2. calculated based on LED output and optical efficiency of lenses and front window
  3. OFF mode consumes 25 microamps (typical) regardless of input voltage.
  4. Consumption by StenLight only – does not include battery self-discharge
  5. TURBO mode is typically limited to 4-5W for long-term use due to thermal limiting.

Technical Specifications


125 grams (4.4 ounces)

Dimensions (main body)

2.2”W x 1.4”H x 1.2”D (55 x 35 x 30 mm)

Dimensions (maximum)

2.7”W x 1.8”H x 1.7”D (68 x 45 x 41 mm)

including bracket, switch handle travel, and connector

Input voltage


7.2 – 18V (operating, Turbo mode)

5.3 – 18V (operating, Low mode, 25C)

-0.3 – 18V (nonoperating/off)


-40 – 140 F (-40 – 60C) (operating)

-85 – 194 F (-65 – 90C) (nonoperating)


  • As with any portable lamp, keep alternate light sources with you at all times.

  • The unit will become hot if used in TURBO mode for more than a few minutes. The temperature is regulated to prevent damage to LEDs and to prevent burns, but the lamp may be uncomfortable to hold, especially after an hour or more of TURBO operation.

  • Use only with approved batteries and cables. Connection to third-party batteries and cables is at the owner's risk – be aware that some third party products use the same connectors with reversed polarity, which could destroy the StenLight unit and/or the third party battery and could cause dangerous overheating of the cable, lamp, and battery.