I haven't had the IR remote complication like the article, but for too-bright-LED purposes, I use different colors of labelmaker tape (Brother TZe type) for different cases:

* need blocking entirely (like on my LaserJet, and a UPS) -- black tape

* too bright, but still need to see, and to differentiate colors (like on one of my living room servers) -- white tape, cut to size with hole punch

* too bright for when i use it in dim lighting, and trying to avoid blue light then (like the ThinkLight on my ThinkPad T520) -- orange or red tape

Some of this tape, I would move to behind the bezels, if I had the device open for service.

Black tape also good for covering up cameras on laptops. If I sometimes use that camera, I make it a strip with a folded-over pull tab, and when I temporarily remove it, I stick it poking up from the top of the bezel as a reminder that the tape is off.

For "hole punch" Pixel cameras in the screen, a hole-punched bit of labelmaker tape works, but IME falls off every few/several months. Secondary purpose: when I have multiple phones, different colors of labelmaker tape color-codes their identities on the screen, to help avoid accidents. (Color-coded cases would be better, but the case series I prefer only comes in black.)