Originally Posted by
PaulRivers
Almost all modern dynamo lights have a "standlight" that keeps the light producing about half power of the normal light when you come to a stop for something like up to 5 minutes, so your lights don't turn off when you stop.
I have a Supernova E3 Pro, and its standlight is so weak that it's on par with a keychain light powered by a button battery. It makes sense to me to have a battery-powered light, preferably with an indiscriminate "shotgun" beam pattern, to help show up in environments like this:
I have to make a left turn here. Not a good place for a headlight that drops to 10% power when stopped.