Guys, im illuminating the side of this object with an area light, but in some points, where i circled, its being reflected. How can i get rid of this reflection and still illuminating this areas? Thx in advance!
select your light, Properties > object tab > Cycles settings > uncheck glossy
I tried Secrop, but with glossy disabled the light is gone 
other option is to move the light into some place it doesn’t show in reflections.
or lower the reflectancy of your object.
Think about this: you can have a light that’s invisible to other objects, but as soon as you render these objects, they don’t see any light so they don’t receive any light.
You can try to render in BI, since it’s not physically based.
Alright, gonna give a try! Thx, Secrop!