Here's a neat little trick I've been using to capture light-paintings using a GoPro Hero 4 Silver along with a clever stacking technique in Photoshop.
In this article, I'll go over how to set your GoPro for Night-Lapses at 15 secs each, and then show you how to combine 10 selected images in post-production using Photoshop to make one long exposure equivalent of 150 seconds.
In the gallery below you'll find an easy 7-step guide that you can follow along with to set your camera for light-painting, click an image below to see it larger:
Now that you're all set for the light-painting part, I'll shift gears into what happens after you take a bunch of 15 sec images. For this part we will probably need to hop on the computer.
You'll want to use a program like Adobe Bridge so that you can see all your files visually in one place - you're looking for the puzzle-pieces that will make up a good light-painting. We'll be using Photoshop to open one layer and then stacking other pics on top of it, building out our light-painting 15 seconds at a time.
Click an image to see it larger:
After we've followed these steps, we should have a stacked image that would be the equivalent result of a 150 second exposure - not bad!
For more tips and tricks, check out my EDU section.