Only stipulations are the angle of view, spacing, wattage and have an approval mark or be "Such that the light is plainly visible from a reasonable distance".
This subject has been broached before, and myself I have no difficulty seeing indicators on all vehicles (although, if I did have difficulty, I wouldn't have seen them so I wouldn't know that I hadn't).
My suggestion last time was that people who have difficulty, should perhaps, see an optician. It's not facetious, I'm not blessed with eagle like vision, it's just an observation.
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