# LED Dimming - General dimming of LED work light - Mosfet dimmer + Navigator

**URL:** <https://discuss.bluerobotics.com/t/led-dimming-general-dimming-of-led-work-light-mosfet-dimmer-navigator/22232>\
**Category:** General Discussion\
**Created:** [January 2, 2026, 3:57pm UTC](https://discuss.bluerobotics.com/t/led-dimming-general-dimming-of-led-work-light-mosfet-dimmer-navigator/22232 "2026-01-02T15:57:40Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![EliotBR](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.bluerobotics.com/eliotbr/32/6937_2.png) [@EliotBR](https://discuss.bluerobotics.com/u/EliotBR)\
**Post date:** [January 3, 2026, 5:15pm UTC](https://discuss.bluerobotics.com/t/led-dimming-general-dimming-of-led-work-light-mosfet-dimmer-navigator/22232/2 "2026-01-03T17:15:49Z")

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Hi @SDI,

I’m not experienced with automotive light bars, so will avoid commenting on that component of the discussion.

> [@SDI](#):
>
> Servo-PWM → duty-cycle PWM converter + MOSFET

It’s worth noting that the Navigator’s PWM driver chip is actually an LED driver. Assuming your light bar is ok with the same PWM frequency as the ESCs are using (e.g. up to ~400 Hz, using the [`RC_SPEED`](https://ardupilot.org/sub/docs/parameters.html#rc-speed-esc-update-speed) parameter) then you can just set the relevant `SERVOn_MIN` and `SERVOn_MAX` parameters for your output to achieve the duty cycle you want, which you can then feed to your MOSFET. A dedicated duty-cycle PWM converter is likely not necessary (unless you require higher frequencies than the other connected electronics can handle).

You could control that with ArduSub’s built in lights joystick button functions, or alternatives like [an on-screen slider in Cockpit](https://discuss.bluerobotics.com/t/cockpit-slider-to-control-light-brightness/20722/2).

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