Light stalking 

Photography. (Makes reference to photogrpahy being the capturing of reflected light.)

I use a Canon camera for my light stalking.

Light stalking by Photo1 January 27, 2019

Light Stalking 

The act of spying, snooping and keeping track of something or someone without direct contact or revealing your obsession/psychotic tendencies.

I might have to drive by his house and do a little light stalking!

Light Stalking by Diet Coke 819 October 15, 2009