Gunner Asch fired this volley in
:

Flash lighting historically has been used ..after it became cheap and
powerful....to reduce the heat in a studio and make working conditions
somewhat more pleasent.

It had little to do with "movement"

But, Gunner, you're missing a point.

With flash illumination, you cannot see and compose your work unless you
have expensive combination flood/flash/diffuser lamps.

The original reason for using flash over flood has been rendered moot by
LED illumination.

Try lights, man. You'll really like the freedom they give you to compose
in 'real time'.

LLoyd