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Glossary - Lumens close

A measure of the power of light perceived by the human eye.  Different manufacturers measure lumens in different ways and it is always worth referring directly to the manufacturers website to determine how they measure light output for thier head lamps.

The Myo RXP is the first Petzl headlamp that is regulated and programmable, allowing the user to choose the order of lighting levels and to precisely adapt light output. To do this, there are three lighting modes, for each of which the user can select the power from among ten possible levels, from 8 to 140 lumens. This feature allows the lamp to be programmed for the type of activity and the length of use. Maximum power lighting would be suited for a short night run, for example; less powerful lighting would help preserve battery life and would therefore be ideal for a multi-day trek.

Eight of the ten levels of power on the Myo RXP are regulated meaning that brightness does not diminish with battery life, but remains constant. The additional Boost mode and customisable SOS flashing mode are enough for any serious user.

This headlamp has Boost mode (160 lumens) and a flashing mode that can be programmed. It is compatible with lithium batteries to optimise performance, even at low temperatures. The Wide Angle lens offers the option of switching instantly from a focused beam to a wide beam when necessary.

  • Weight 175g (including batteries)
  • Optional top head strap (supplied)
  • Compatible with lithium batteries, which are lighter and better at lower temperatures
  • Can be used with compatible rechargeable batteries
  • Automatically switches power mode when batteries are running out
  • Battery charge indicator light
  • 1 x 3 Watt LED
  • 8 - 140 lumens (160 lumens in Boost mode)
  • Range: 97 m (Boost mode)
  • Burn time: up to 95 hours
  • Batteries: 3 x AA (supplied)
  • Rated IPX4 (splashproof)

Outdoor Magazine - Editor's Choice Summer 2009

Brand Model Weight inc
LEDs Max
Modes Batteries Regulated
Mammut Lucido TX1 150g 1x HiFlux
2x Definition
3x red
70 lumens 105m 4 3x AA
Petzl Myo RXP 175g - 205 lumens 90m ≤5 3x AA IPX4
Petzl Nao 187g - 355 lumens 108m ≤5 Custon Li-Ion
2x AAA
Icon 230g 1x QuadPower
2x SinglePower
2x SinglePower (red)
200 lumens
35 lumens
35 lumens
4x AA IPX7
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Expedition 4
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