Customduo V42 Operation Manual - Page 5

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V42 Fitting Guidance

CustomDUO LED upgrade modules will work with all variants of the original pre 2018 Petzl Duo. Modules

are not available for the 2018 DuoZ and DuoS, which are factory sealed and not designed to be upgradeable.

Prior to fitting it is of course necessary to remove original reflector, bulbs, LED modules, etc. Unscrewing the

grey bezel in order to remove the front window can sometimes prove challenging if Duo has been left to rot,

but inevitably they do come off. (Hint, if you can't do it then find someone with strong hands. The trick is to

squeeze and turn at the same time !!!)

CustomDUO Omni modules are a simple push fit into the Petzl Duo lamp housing. Electronic connection is

via the 2 pins on reverse of module which locate in the Duo bi-pin bulb / LED connection socket. Orientate

Omni module in the body of your Duo, aligning the contact pins, and push fit module into place. Ensure the

module is sat down fully in Duo body. Test operation of module. If module does not work immediately, then

read about battery polarity below.

To conclude, refit the Duo front window. Some silicone grease on the seal and threads is always a good idea.

Holding window in position with thumb, refit the grey plastic bezel until the Petzl correct fitting alignment

marks (on top of the lamp) are correctly orientated. The marker formed on the grey screw bezel should be

somewhere in between the two markers formed on the top of the yellow lamp body.

Polarity

Very occasionally we come across an early (pre 2004) Petzl Duo which has been wired up back to front, and

the polarity is wrong for the Customduo LED modules. This affected some, but not all early Duos, and these

Duos are now extremely rare. Polarity conscious LEDs hadn't been considered at this time so it wasn't

important which way around the positive and negative were wired at manufacture. If you fit your

CustomDUO module and it does not immediately work, chances are that your Duo is wired up back to front.

The solution is simple. Reverse the polarity of the batteries in the holder, i.e. positive to negative, and vice

versa. The module will then work. CustomDUO modules are polarity protected, so you will not have

damaged the module by finding this out. If this does not work then please contact us. There is invariably a

solution.

Batteries, power and light output

As standard, the Petzl Duo uses 4xAA batteries (some use 4x C cells). It is important to note that the highest

power settings of the v42 module, i.e. 700mA flood and 700mA spot, 1400mA combined, may not be

achievable dependant on battery type (NiMh or Alkaline), battery quality / condition, and level of charge.

Lamp condition is also a factor. If the batteries cannot deliver e.g. the 1400mA required, the lamp will

operate as normal, but not at full brightness. The slight upside of this is that reduced power draw from

batteries by default will result in extended operating durations.

In our opinion, 1400mA is at the limit of what can be realistically achieved with Petzl Duo and the best AA

cells, given the battery technology currently available. For best result we suggest low self discharge NiMh

batteries, such as the 'Eneloop' brand.

The regulated power settings levels for modules are given in mA. To determine the approximate regulated

duration of light on your battery arrangement at a given power setting, simply divide the mAh capacity of

your cell pack by the mA power draw at a given setting. For example, using 2100mAh NiMh low self

discharge AA batteries at a power setting of 350mA will give a regulated duration in the region of 5-6 hours.