Lumonite Compass R Headlamp field use review. Disclaimer. This headlamp was sent all the way from Finland for review from the manufacture. Yes that's correct. Finland! I do like scandi knives such as Marttiini but these are my first lights from that nation. This is field use review of the Lumonite Compass R headlamp. Here is information from the manufacture. http://www.lumonite.com/en/lumonite_compass_r/ During field use I found the UI easy to use though the keylock was entered accidentally a few times at first when going into moonlight. It was easy to enter turbo mode then return to the last mode used. I like using the headlamps as a single click on and off light with memory of the last mode used. Nice and simple to use. I like that. The headlamp. The optic reminds me of the Armytek Wizard. No PWM detected on cellphone or shake test. Cellphone camera looks clean in terms of PWM or other distortions within the output. This produces a beam with a good deal of flood but can project a beam a useful distance. If you like beams on the floody side this headlamp is a good option. Notice the switch is illuminated during operation. I somehow feel the switch gets the light from the main LED. Nice floody beam profile. Nice big yellow switch which is easy to find and use. On one side of the bezel are ribs to better transfer heat away from the LED. The same for the area below the bezel. The threads came lubricated and felt smooth. The headlamp can be physically locked out with a twist of the tail cap. There is an O-ring for water resistance. Inside the tube there is a spring on the end near the bezel with some kinda stopper. This differs from other headlamps I own which have the spring on the tail. One result being the polarity is reversed with positive end at the tail cap. The headlamps are polarity protected as mistakenly inserted the batteries upside down a few times. No issues beyond a need to flip the battery around. There is a guide to proper polarity within the tube. The Compass R comes with a proprietary 3600 mAh lithium primary. The 3600 mAh 3.7 volt lithium ion is propitiatory. 3.7 nominal volts times 3.6 ah is 13.32 watt hours. Assuming my hack math is worth anything that is a a bunch of power. The Compass R can use regular 18650 but the supplied propitiatory lithium ion battery should only be charged in the headlamp. I have never actually tested if a standard lithium-ion would also charge. I don't like to monkey around with Lithium-ion batteries so sticking to the manufacture's recommendations. The voltage range is 2 to 4.2 volts so use a protected 18650 lithium ion. However there is an exception. The headlamp failed to work with a 18650 Sanyo NCR18650GA 3500mAh High Discharge Flat Top. The reason near as I can tell is battery length. Sanyo red.