I always carry a pocket flashlight clipped into my left front pocket. And the right front pocket always as an ample knife clipped into it. Both are used ALL the time, because they are always right there when the opportunity arises! Pistol is always along for the ride when I leave the house.
These days, the light is a D25A with a li-ion cell. Awesome light. And I use it just as much during the day, as at night.
Just today, in mid-afternoon, walking outside in the Arizona desert, I pulled out the trusty D25A and used it to peer into the small, shrouded opening of a Cactus Wren nest.
When you carry a light with you all the time, it's amazing how often you find a need for it - even in broad daylight! These opportunities to "see better with more light" have happened time and time again, more often during the day than at night!, since I've been carrying a light at all times. Many dimly lit spaces present themselves in the day as well as the night and having a great light always at the ready has been a blessing for me.