that is probably one big reason why human beings have evolved in what they are now - using light emitters and exposing themselves to light emitters not just emitted thru the sun and also experiencing multiple light reflections/filtration in general and that individual and specific ...
... but who needs an expensive reflector? as:
http://www.starlightuses.com/
is it not just for the scenery of it? sure i would enjoy a sirius sunbath ...
moon reflected light is present under certain circumstances so nothing special if an animal or bacteria reacts in a special way (as a habit) ... it is not just the light itself but rather the timeframe in which it is (or was in evolution or was not in general) available ...
so is light in general just a result of an active structure in movement as a current result in a space port different than where it is present as this active structure as an instant - why not?
the em-spectrum -to me= just a local translation