Connecting LED landing lights on quad copter

Hi Everyone,

I want to connect a 12V LED light, to my 450 quad using APM 2.8 which can be turned on and off on demand.

I want to assign the Gear switch on Devo-7 Remote Controller to control the LED.

So by flicking the Gear switch I should be able to turn the LED on and off.

Thank you in advance.