Updated HID lights (markdown)

HID-lights.md

@@ -28,4 +28,19 @@ Arcin code in [arcin-infinitas](https://github.com/kinetic-flow/arcin-infinitas/
 
 ## Hardware reference
 
-[Rhythm cons wiki](https://rhythm-cons.wiki/getting-started/wiring-leds/)
+[Rhythm cons wiki](https://rhythm-cons.wiki/getting-started/wiring-leds/)
+
+## Other lights supported by spice that are *not* USB HID
+
+### Proprietary protocols
+
+Some proprietary protocols are supported:
+
+1. LIT board (sextet) for DDR cabs
+1. PIUIO
+1. SMX stage / cab (requires [custom DLL](https://github.com/spice2x/spice2x.github.io/issues/228))
+
+
+### SpiceAPI
+
+API is a good way to extend lights support; implement the client code (using the provided sample) and have it directly interact with your device.