I can't tell if it lights up on both sides, so it make be dark on one side if used inside a blade. But it's compareable to purchasing LEDs individually as far as price goes.
http://www.theledlight.com/flexible-RGB-strips.html
On the same site, I also found '5 MM LED Mini-Reflectors'. The LED sits inside a tiny reflector that focuses the light forward on a 5 degree path.
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