Commando303

I thought I read, at some point, that B&M's Line Plus taillight gets brighter as the bicyclist slows down, much to the effect an automobile's taillights do when its driver applies the brakes.

Now, however, I seem unable to rediscover this fact, anywhere. Does anyone know if, indeed, the B&M TopLight Line Plus taillight — or, really, even any other — has this feature?

Thanks.

2_i 

The key aspect of Topline Plus is that it spreads much of the intensity of light from LEDs over a strip so that the lamp does not hurt the eye from up close distance. A standard bright LED can concentrate all intensity over one cell in the eye and badly affect the eye. I am unaware of its standlight having an increased brightness.

zzyzx_xyzzy

It's really just the standlight circuit engaging. As you slow down to a stop adn your dynamo turns slower, the brightness of the light declines -- say, it drops from 100% to 40%. Then finally the standlight engages and brings it back up to 60%. That's what it looks like anyway.

That said, the Line Plus is probably the most visible taillight I've seen on a bike.

Commando303

Perhaps I was unclear: Does a taillight for bicycling exist that will, by its design, shine more brightly when the cyclist slows down, and dim down a bit when she or he pedals faster? (Of course, enough energy will have to be generated by pedaling, initially, to give the light the nominal charge it requires.)

desertdork

No, you were clear. And, yes, there is such a light. It's the Busch&Muller DIWA Plus seen
at the bottom of this page:

https://www.peterwhitecycles.com/taillights.asp

Commando303

That's it: thank you!

"The new Distance Warning, or DIWA system for hub dynamos from Busch&Müller senses when the bike slows down. When riding at night with your lights on, the taillight will glow brighter when you slow down, just like the brake lights on an automobile. In the daytime with the lights off, the taillight will come on just as a car's brake lights would." (https://www.peterwhitecycles.com/taillights.asp#diwa)

Now, I just have to decide whether I'd prefer this system, or the Line Plus...