LightPainting LED Light Pen

This is my first LightPainting tool that i designed to a point where i think that it is perfect for its intended use.
LightPainting is a form of photography in which a camera is set to long exposure and some elements are "painted" with light into a scene (or sometimes in pitch black).
The second image shows an example i did with this tool.
This is the most basic LightPainting tool, but it is very versatile and can be used for a lot of effects.

I designed two versions of the handle. One is