Tactical switching circuit usually secondary?

[Walterk]

Is the amps. running throught the tactical / remote tail cap switch always less then the amps. powering the bulb?

I think the Fenix TK40 has a low amps. circuit for activating and switching modes. As in:
The mains for the bulbs runs straight to the electronics in the head, the signal to control the electronics uses the earth/body and one of the poles of the battery.

Is this a regular setup for flashlights with electronics on board?
(e.g. regulated power drive or xenon )

Something I need to know in case I want to make my own 'remote switch' working safe and sound.

 

[Wavelength]

There are plenty of lights where all the current will flow through the on/off/mode switch, be it in the tailcap or elsewhere. Whether the current matches the current at the bulb/LED depends on the driver setup (current at switch could be more than at bulb or driver), but if the switch is in series with the batteries, it will need to pass the full electrical power consumed by the light. I would check a light's circuitry very carefully before deciding that the switch is not passing this much power.