There IS such a thing as too much light. It may be a combination of a bright assed light and a poor job aiming the light properly, but it was not safe. The amount of glare on the windshield alone (dirty from camping), made it difficult to maintain my bearings in my lane. I found myself driving by braile as I passed the chap.
A DiNotte taillight still puts out far less light than a single car headlight (or a full lightbar on a police car). If your windshield's so dirty that a DiNotte makes it impossible to see through, you'd better hope you don't meet any motor vehicles (or emergency vehicles)
Best bet: wash your windshield... most cars have windshield washers nowdays.
As for me, even if I could get by with a SuperFlash or LD1100 at night, the DiNotte or Nova still hold all the aces in the daytime. Out on the highway, I definitely appreciate being visible from 30+ seconds back, particularly to people who intend to decelerate and make a right turn onto an intersecting highway. So I have no regrets about the DiNotte, or the Nova either.