Originally Posted by
Chistophe516
Not just daytime.
But until, that is done. There is no visible sign. That something is wrong. Lights will become dimmer, as the light is obscured
Is that much mud really a problem? I tend not to ride much mud in the first place, and generally don't ride through mud at night. At any rate, it's easy enough to wipe off during a rest break. Most cyclists won't realize a rear red light is covered with mud either because usually they're looking forward and not at a red light on the rear while riding.
But at any rate, IMO you should always ride with red rear lights while riding at night anyway. Reflectors should just supplement your lights.