Here are the possible solutions for focuser of light clue
Answer
Clue
Relevancy
lens
Clue
Light focuser
Focuser of light
Definition
a piece of transparent matter with one or both surfaces curved to cause regular convergence or divergence of rays passing through it
blinders
Clue
Horse focuser
Definition
BLINDER, a thing that blinds
glorybeam
Clue
"The light" of "I saw the light!"?
laser
Clue
Light in a light show
Light-show light
Light show light
Light in a light show, perhaps
Definition
a source of high-intensity optical, infrared, or ultraviolet radiation produced as a result of stimulated emission maintained within a solid, liquid, or gaseous medium