CustomDUO modules

Simple (r02) 

Now Available

Latest v42 (r02) and Simple (r02)

As the name suggests, the Simple (r02) is a no frills version of our popular v42 module, for the Petzl Duo. Well suited to those who like the operation of their caving lamp to be really straight forward, yet practical. New features for the Simple r02 include our new integrated alloy heatsink, and two main LEDs for spot and flood.



Simple (r02) Specification 

  • Will work with any original pre 2018 Petzl Duo - the Cavers Duo!
  • Integrated alloy heatsink design
  • Twin main LEDs, flood and spot
  • 3 regulated light settings; low, medium and high, 340 lumen maximum output
  • Forward bias flood optic, for optimal use of available light for caving
  • Latest high power XP-G3 LEDs (172 lumen @ 350mA @ 85 degC) 5000k neutral - cool white
  • Low power moon setting (8 lumen), and battery charge level indication 
  • Super robust, proven circuit architecture
  • Simple push fit directly into existing Petzl Duo pilot bulb connection, see Fitting Guide 
  • No power drain on batteries when lamp is switched off
  • Progressive dimming at end of battery charge (will not just shut off when batteries are flat)
  • 6.0 volt maximum input (4x AA batteries), or 3.7v li-ion conversion !!

The Simple has three power settings (see following table). To switch between the settings, use the down switch on the Petzl Duo. Switch on-off-on-off etc, to move between settings 1-2-3 ... 1-2 etc, in a looping sequence. Setting 1 (low) will blink momentarily when selected to make it very easy to determine where you are in the sequence, and which setting has been selected.



LED level


(5000k LEDs)


(3000k LEDs)


(est. 2500mAh eneloops)




50 lumen

44 lumens

25 hours




172 lumen

156 lumen

7 hours


spot & flood

350mA + 350mA

340 lumen

310 lumen

3 hours




8 lumen

8 lumen

includes battery
level indicator

* estimated light output at 85 degC dependant on capability of batteries used

Operating the switch very quickly, on-off-on ('double switch') will operate moon (camp) setting for maximum run time. At this point, the main LED will blink 1 to 5 times to indicate the approximate level of battery charge (based on 4x AA batteries).  

The Simple features a 3 second 'first' mode memory. When lamp has been on for more than 3 seconds in any setting and is switched off, then it will automatically restart at the first setting (low) when next switched on. 


The Simple has zero battery consumption when switched off, so there is no requirement to disconnect batteries. However it is probably best practice to do so when not in use for more than a few days, to reduce any stress on battery contacts in Duo box.