I once bought a reel of leds from flea bay -they were approx £11 as i recall -there is loads to choose from-they were the waterproof ones -self adhesive -worked well for a while and then started to fail over the first winter.So removed them -I think they need to be further encased to keep the weather out.
I have used them successfully internally to replace flourescent strips and add extra dimmable lighting.
Fiamma actually sell them specifically to fit their awnings. Several different type depending upon where you want to fit them on the awning. I suspect the biggest difficulty is getting the power to them.
I have found that Johns Cross is usually the cheapest for Fiamma stuff
The awning light on our motorhome was full of water and rusty too.
I wanted to fit led and bought 2 metres of good quality water proof warm white led's off the bay.
I was going to fit it under the awning on the near side, Though after driving down some narrow lanes and catching some hedges etc..
I decided to fit the led's down the side of the door frame with super sticky silicone, The edge of the door protecting the led's.
I used the original hole for the wiring and re soldered the led's with white wire so as not to show and fitted a switch for it inside a cupboard.
works a treat and is very very bright, I may at some time in the future shorten the led's. cost about £30
hope this helps