WRT several mentions of “warm white” vs. “cool white”, night vision, eye damage, etc. …
A while ago I picked up a very cheap pack of 3 small penlight-style LED flashlights on a whim while getting something else because I thought they’d be useful around the house. They’re very small and the barrel is just big enough to hold the two AA batteries that power it.
There is a warning not to shine them directly into your eyes and man, for those it’s a warning worth heeding. The light is bluish-white and I think the package itself warns that they’re high in UV light. I can’t really use them as utility flashlights because even a short exposure to the light, even at a distance, leaves me seeing afterimages for quite some time. If I need a flashlight to work on something, I’ll use my 2-cell, 3-cell, or 4-cell Maglite with ordinary bulbs – even the bright 4-cell causes no such issues. These things I just keep around for emergencies.
I’m sure that’s not the case with all or most LED flashlights, and some are even rated as “warm white” similar to a filament bulb. Just something to keep in mind. A filament bulb just glows, but with LEDs, you don’t necessarily know what frequency spectrum they’re emitting.