What do you mean by the “qual­ity” of a light beam?

Scuba Diving - - SCUBALAB -

Quan­tity of light isn’t all that matters for a dive light to be ef­fec­tive and easy on the eyes. Just as im­por­tant are more-sub­jec­tive fac­tors such as color, abil­ity to pen­e­trate the wa­ter col­umn, and how soft or hard the beam’s edges are.

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