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StenLight S7 Technical Specifications

The StenLight S7 is a rugged, compact, high powered LED head-torch 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.

The tough build and light weight make it ideal for other demanding pastimes, such as climbing, ski touring and mountain biking. Anglers and sailors will appreciate its waterproof qualities, comfortable harness mount and long battery life.

Key Features:

  • Compact and extremely tough anodised aluminum case with twin LED beams
  • Lamp unit weighs less than 125 grams (4.4 ounces)
  • Ultra-lightweight lithium-ion battery pack, designed to be helmet mounted: no more heavy belt packs and snagging cables: runs for over 7 hours at high setting
  • Four brightness levels, from low (over 3 days of light!) to turbo
  • Operates off any 6 to 18 volt DC power source: invaluable on long/deep trips where recharging is impossible
  • Long throw, high durability magnetic switch (no moving parts penetrate the sealed lamp body), designed to be used with gloves
  • Water-resistant down to 7.5 metres (25 feet)
  • Swivel bracket supports easy adjustment: light up your feet or the sky. Will fit any helmet designed for blade mounting, or use the supplied harness
  • Solid state and shock-resistant, with extremely long LED life (>20,000 hours)
  • Flicker-free all-analogue control circuit for constant brightness
  • High electrical and optical efficiency make the most of your batteries (96% electrical efficiency from 7.2V, 93% from 12V)
  • Smooth, optimised beam pattern with user-swappable lens options: the optics can be customised to give one spot and one flood beam
  • Temperature limiting to prevent overheating of LEDs or exterior

The StenLight S7 uses a high-efficiency all-analogue control circuit that regulates LED current in all brightness modes, and limits itself to a safe temperature by reducing the 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
Setting Power consumption Run time 1
LG723 / LG750 		Light output 2
S7+ (R100)
OFF 200 microwatts 3 20 months 4 -
LOW 100 milliwatts 230 / 500 hours 5 lumens
MEDIUM 600 milliwatts 35 / 75 hours 38 lumens
HIGH 2 watts 7 / 15 hours 130 lumens
TURBO 4-7 watts 5 2-3 / 5-7 hours 420 lumens

Please note that many manufacturers exaggerate their emitter brightness readings, or give the values before they have been attenuated by lenses or glass. We do neither, and our figures are deliberately conservative.

Technical Notes:
  1. All runtimes are 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, figures are without thermal limiting
  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
Weight 125 grams (4.4 ounces)
Dimensions
(main body) 		55mm x 35mm x 30mm (2.2"W x 1.4"H x 1.2"D)
Dimensions
(maximum) 		68mm x 45mm x 41mm (2.7"W x 1.8"H x 1.7"D) 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 (non-operating/off)
Temperatures -40 – 140 F (-40 – 60C) (operating)
-85 – 194 F (-65 – 90C) (non-operating)

Warnings:
  1. As with any portable lamp, keep alternate light sources with you at all times.
  2. 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.
  3. 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.