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If you've the lights on, it's drawing current.
If you've the lights off, it's not drawing current.If there is no current draw, the hub is not experiencing resistance.
Hold front wheel in air, spin with light on; then repeat with light off. You'll see the resistance your exposing the hub to by having light on all the time.
Turn the light off when not needed. It's stealing 4Watts, or around 3% of your power input.
skinny
But isn't the voltage and current drawn by a charger always going to be the same?
Ie, an iphone charges at like 5v and 1 amp right?
So if you plug it in when the battery is flat and charge it until it's full and then unplug it'll have drawn 5v at 1 amp for say an hour or so.
If you leave it plugged in all the time and the charger maintains the battery at 100% it'll draw 5v/1amp all the time.
No?
I have kind of wondered whether I make things harder for myself by leaving my lights on all the time. I thought that in setups like mine where the on/off switch is on the light, the hub always provided power and therefor had the same resistance. You had to have a switch on the hub (is this even a thing?) that turned power generation on and off to get a difference in the resistance.