I have not yet ripe cataracts ( let's see if they suddenly ripen if I run the surgeons foot over in my wheelchair?)
Anyway I play with LEDS, my own choice for carry light is a four 7777's (now called Promethius ) Preon MKIII it's triple A battery powered ,so easy to freed away from home ,it also puts out a crazy amount of light(sometimes it outshines my larger lights .
Lights are a hobby and this one is near perfect from firefly mode that is like 1 lumen all the way to turbo like 300 lumen , it has the output for anything you may need it for.
I retired from emergency services so for me a knife a penlight!etc are just everyday survival items everyone should carry .
Happy eye opening day!LOL