CSI to locate that puppy urine jimB, Great idea
any "day light" sunny or overcast days have UV , lower levels of UV on a overcast day.
Any artificial UV light from Flashlight, black light, halogen etc. used to enhance the glow will work anytime of day if that is the glow effect you want from your lure.
In my opinion no need to charge in daylight! and you can control how much brightness for night fishing by charging your lures before heading out to your spot. The extended glow lures will last for hours with a good amount of glow if you play with timing and preferred glow brightness.
Or if your fishing in the dark with regular glow lures just keep charging them every 15 mins.
Experiment at home and be ready for the season.
I red a quote once " if it don't glow it don't go " I personally and this is me.... use glow lures about 80% of the time but not 100% of the time. No extra charge in day light..
Just sharing info and trying to feed my hunger to learn more.
Thanks