Originally Posted by vol

I see, I agree in shady areas lights are very useful, more than hi-viz. I think it makes sense if much part of your ride is in such areas, or it's overcast. The dilemma for me is, since I rarely pass dark/shady areas during day time, if I have a taillight on all the time, by the time I pass such an area, much battery charge has been wasted before the moment it's really needed, by which time the light may not be as bright as it needs to be.

Originally Posted by PatrickGSR94

In my experience, flashing taillights, even bright ones, do not use much battery power. During summer months when all my rides/commutes are in daylight, my Hotshot lights can last for 2 weeks or more, easily. In winter when most of both commutes is in dark or low light conditions, running one light steady and one on slow pulse mode, I can still get a week on a charge.

Battery charge has never been an issue for me to run my lights at all times, 24/7.