This is inspired by commercially available backdrop reflectors.  There are many examples available ranging from $20 to nearly $600.  I figured that $5 worth of filament and electricity was a good deal!

This is used to light up backdrops, green screens and the like.  I printed mine in white PETG but got impatient and stopped the 17 hour print after 14 ½ hours.  It still works perfectly :-)

Thanks to @Socialmocracy for doing the hard work of designing the Bowens S-Mount.