Oct 29, 2013

Jetbeam JET-I V2.0


The IBS circuit allows you to set three defined output states (A, B, C) through a continuously variable brightness mechanism similar to some Liteflux, EdgeTAC, and DBS lights. Interface is the same for all IBS models, and is as follows:

Mode Switching
Default settings for the three modes are: A is Default High, B is Default Low, and C is the warning signal/stobe. See my comparison data below for approximate estimates of the relative output levels. There is no memory mode - when switched on each time, the light enters mode A. Lightly press the tail cap button (i.e. quick flash), and the light will go from mode A -> B -> C in cycle. 

Changing the Brightness Level
To access the IBS cycle in any of the 3 modes, lightly press the tail cap button three or more times within one second in the mode you want to change. Now in “Brightness Setting” mode, the output will ramp in brightness from Min (5%) to Max (100%) gradually. Once it reaches Max, the light then starts over at Min and repeats the process. A complete cycle is supposed to take about 8 seconds according to the manual, but I’ve found that my engineering sample takes about twice that long (see Ramp graph below). During this process, the light flickers once at Min (5%), twice at 50% output; and three times at Max (100%). Simply turn off the light to select the output level you want, and leave it off for at least ~2 secs. It will then retain this setting the next time you turn the light back on.

Special Functions Mode
After entering the Brightness Setting mode of the Hidden Menu, lightly press the tail cap button once, and the light enters the Special Functions mode - which goes from 1HZ to 15HZ strobe, warning signal, standby signal, 100% SOS and 5% SOS. Again, if you want to select any of these functions, just turn off the light, wait 2 secs, and it will be set for the next time you turn on.

Reset Function
From the Special Functions mode, lightly press the tail cap button once and the light enters Reset mode. Turn the light off, wait 2 secs, and when it comes back on you will be in the factory set default A, B, C settings (i.e. A: Default High brightness; B: Default Low brightness; C: Warning Signal).