I have several LEDs that support up to 6V perfectly. I took them from an old flashlight.
I took a servo lead extension and i have connected the LEDs in parallel to the positive and negative wires respectively in one tip. and I have connected the other tip to chanel 5, same chanel i am using for flaps. It work pretty nice since the servos are fed with an output voltage of my receiver of between 4.8 and 6V.
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You must cut the yellow/white signal cable, u won't use it. You could also add a switch to turn on/off manualy the lights if you want.
This is a really cheap way to do it. You have to double check all the connections, otherwise a short circuit could occur and you will burn the receiver.
I did it whit my cessna using a Y lead for both, lights and Flaps and worked fine.
Hope it works for u.