How to reflect\catch light but be invisible on render?

Question

I want a mash was able to catch light but was invisible on render. I want this effect to happen, but the plane was invisible. Is it possible? Or can I cast colored shadow? I need this in cycles. This question is not about "how to make an obect invisible" it's about how to make in catch light.

Fore example

I need this happen

How can I get light accents without white face??? Do you see that light distributes unequally on shaped objects, how can I get only light fingerprint on transparent background?

Check out the Light Path node.. maybe this tutorial will help — Robin Betts, Mar 11 '19 at 18:47
Possible duplicate of How to make a cycles light emisson object invisible to the camera? — brockmann, Mar 11 '19 at 19:14
@brockmann no, compared to that post I need the cube to be invisible but refract\reflect the light. — mevsme, Mar 11 '19 at 19:27
Restrict the visibility to camera in Ray visibility, or use a light path node and Is Camera ray to control the mix between transparent and emission shader/ Read the following link: How can I make an object invisible when I render in Cycles? — , Mar 11 '19 at 19:39
@cegaton there is no aswer for my question, remove the duplicate please. I need invisible for camera object was visible for light. https://imgur.com/xfMyDN4 at this picture it's invisible for the light. — mevsme, Mar 11 '19 at 19:59

score 0 · Accepted Answer · answered Mar 12 '19 at 00:37

I couldn't manage to make this "light catcher" using nodes but as a workaround or just alternate method you can use Baking. For this answer I'm using Blender 2.80 Beta and Cycles but the workflow is the same as in 2.79b.