Back around 2000 when I was just starting on my PhD work, I got the chance to work with the PhD who created these light & sound goggles:
I've got one along with about a dozen of the glasses that each use different colored LED's. Several pairs are considered "experimental medial devices" by the FDA because they're twice as strong as they legally should be! The device has two outputs (for both light and sound) so that couples could use the device at the same time.
(More info here if you're curious about the device: https://www.photosonix.com/products/nova-pro-100/ )
Anyway, the usual goggles had four LED's right in front of each eye (you wear these with your eyes closed and the LED's blink). The different colors cause different effects and, after awhile, are not strong enough (in my not so humble opinion!). So we doubled up the number of LED's and used both light outputs!
I still have and use these; they are AWESOME! (Especially while using certain "plant medicines!" ? )
Anyway, when we started the project, we were limited in what colors we could use and I was bummed that my favorite color (blue) wasn't available... Then I got an excited call from the guy saying he had access to some from someplace in Japan! I never made the connection before, but I wonder if it was from the same company! I was VERY happy to get both some blue LED's as well as white. My favorite pair of goggles has blue in the middle surrounded by white. ?