I just found this article about the benefits of (infra) red light therapy which is also beneficial for our 2D friends, including chickens and cows!
Red Light Therapy and Animals - Red Light Man
Red (and infrared) light therapy is an active and well studied scientific field, dubbed the ‘photosynthesis of humans’. Also known as; photobiomodulation, LLLT, led therapy and others – light therapy seems to have a broad range of applications. It supports general health, but also treats various...
redlightman.com
[...]Dogs are one of the most well studied animals in light therapy studies. Only rats are more well studied.
Dog’s eyes aren’t sensitive to red light, making them oblivious to red light therapy
The variety of issues looked at include; healing after heart attacks, hair regrowth, recovery after surgery of the spine, chronic wound healing and a lot more [5-8]. Much like in human studies, the results seem positive over a wide range of conditions & doses. Light therapy may be useful for all common dog skin issues and for areas of acute and chronic pain. Canine light therapy treatment by vets is increasing in popularity, as is at-home treatment.
If you have a pet, the same light therapy devices you use for yourself could also be used on them, treating a problem or simply optimising their general health/vitality. Fortunately, most dogs and cats seem perfectly happy around (infra)red LED/laser light as the low heat output is comfortable, and their eyes aren’t particularly sensitive to red wavelengths. Any pain-free and side-effect free treatment that you can do at home and includes lots of close attention from you, will no doubt be adored by your pets.