Josh Burker has published a book - The Invent to Learn Guide to Fun / Classroom Technology Projects, Constructing Modern Knowledge Press, Torrance, CA, 2015. In his book, Burker devotes a chapter on making Glowdoodlers, electronic colored light pens. Burker gives two methods for designing LED Glowdoodlers.
Step-by-Step Making Instructions
Adobe Illustrator Template for both LED Light Pens - these templates have been pre-cut and are available for you to begin work immediately.
After you make two styles of Glowdoodlers, you need to install free software available for download at lightpaintlive.com. This software treats your laptop's camera as a long exposure camera to capture light from your Glowdoodler.
Design Challenge
Glowdoodler Light Paintbrush with on/off Switch
Simple Glowdoodler Light Pen