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We also know that typical 3-5mm LEDs have the rounded head on them that creates a light focal point. This isn't very conducive to making a single beam of light when using multiple LEDs.
The fix to this is simple - make the top of the LED flat. This will project the light outward and forward, which will allow it to blend more easily with the output from the other LEDs.
Something to consider when making a prototype light, for anyone who will do it.
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