one page back?
echo -n LEVEL > /sys/devices/system/fl_tps6116x/fl_tps6116x0/fl_intensity
where LEVEL is an integer between 0 and 254 (or 255?), and 0 means "light off". You have to run these commands from a command line, so install the usbnetwork package and access your device through that.
Sorry, but there is no "step-for-step tutorial" for using Linux command line tools - if you want to dive into it, you have to learn it the hard way, like everybody else here did.
so just shove that in a script. and attach that to an event you can control somehow.
Dont have a PW yet... so not sure on launchers. Sorry