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Old 04-24-19 | 04:42 PM
  #23  
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Marcus_Ti
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From: Lincoln, Nebraska

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Originally Posted by tcs
Simplistic comparisons of one light source to another rather break down, do they not? I certainly wouldn't want to look into a 75-lumen laser beam.

At the same lumen level, this (all too common) cycle light beam shape



is more likely to be annoying to oncoming road users than this one:

Simplistic comparisons are all one can really do. Not even in car headlights are foot-candela specified AFAIK. And lumens (flux) is a terrible unit for the job. And there are no units/specification for beam dispersion, nvm beam shape, nor projector/reflector efficiency--nor will you find a manufacturer specify it.

A 75 lumen laser is equal to about 10 milliwatts...which by laser standards is quite dim. Due to the light being intense, and collimated, and not tapering off much over normal distances for humans, still dangerous (above 1mW really is). For lecture purposes and safety 1mW is recommended, but due to manufacturers sexing-up their lasers and underrating them, many "1mW" lasers are actually 1-20X brighter than that.
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