I created these props for a local production of the Little Mermaid musical.
In the staff itself, there are likewise 3 individual strips, stuck to a steel tube a’la garden center green plastic coated tree stake. All 3 run all the way from the top to the bottom, and have polyfill fiber diffusing the light. There is a USB on-the-go power stick inside at the top that provides strong portable power, and an arduino and plugs that get stuffed between the trident head and the staff. It’s all self-contained.
It looks like it changes from a regular gold trident to a magically charged one that is going to cause some crazy effects! I misted the whole thing in gold mirror paint just until it was opaque in daylight or indoor light, but the LED would still shine through brightly without having total darkness on a set. It’s essentially the same technique of a scrim or a one-way mirror.
I wrote the software/art myself, using only basic hardware libraries like neopixel. It’s particle-based, one effect is a rushing fire effect and the other is a bubbling colorful swirl effect. Both are 3d, they take advantage of the arrangement of the strips from one to the next in a cylindrical way.
The trident is controlled with a touch interface that is designed to look like a copper emblem at the head of the staff. It stays gold until you touch. A quick touch will cancel. leaving it alone will build and hold the effect as long as you want, until you touch it again to let the effect destruction sequence run until it is back to plain gold.