Adafruit sells a few different pre-diffused NeoPixel "neon" strips. If you're looking for a solid bar of light, these are a good option. The strips are encased in a solid chunk of silicone. They're flexible and bendy from side-to-side, which is something that standard NeoPixel strips can't do. 

These are great for making neon signs, stick-person costumes, or any project where you want a solid diffused bar of light.

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