Originally Posted by
landdnl
When I complete the install on my new bike, which will be a while, will I notice a reduction in light quality with the tail light attached?
Not in light quality. But should you ride with a hub dynamo, and should you choose a tail light that draws a lot of juice -- the B&M Secula is the worst offender I have come across -- you might experience a slight tremble originating in that dynamo at higher speeds. That is, approaching the 30 km/h | 19 mp/h mark.
With just a front light, those vibrations needn't appear at those speeds. Though that again depends on the brand of hub dynamo, combined with the characteristics of your bike's fork, etc..
Should you use a bottle dynamo, I haven't said anything.