I had been using a Cygolite Dash light to supplement my Luxos U dyno headlight with it's flash function and as a high beam when needed. The dash worked fairly well, but being a flashlight type light it does have some shortcomings in regards to beam shape, near field hot spot, and glare.

I won't go into a full description as an excellent one can be found here, REVIEW: Specialized Flux Expert Bicycle Headlight - Photo Intensive, but rather general impressions in real world commuting duty.

I installed it in a few minutes under less than ideal low light conditions being cold and wet in a park shelter. The only tool needed was the supplied hex wrench.
I didn't actually use it much as I wanted to give it a full charge first, but the mount proved to be rock solid on the 30 mile ride home that included several miles of unpaved trail, and rough roads.

With a full charge I took it on a 6 mile test ride on the local rural MUT . I also took the opportunity to compare it side by side with the Luxos U and Cygolite Dash. Even in the dark and rainy conditions it only took a few minutes to get the feel for the remote switch and cycle through all the functions. Its very intuitive, and clearly was engineered by people who actually ride.


All observations were made in a dark area with minimal ambient light, and fairly heavy steady rain.

The Flux on low power-low beam, the Luxos is about the same brightness with a bit wider spread with sharper cutoff that throws a little further, the Cygolite on its highest setting is a bit brighter right in front of the bike, but the beam is narrower with a shorter throw.

The Flux on low power-high beam, it throws as far as the Luxos, is a little brighter than the Cygolite, and throws light higher like a true high beam rather than just being brighter. It doesn't throw light way up in the trees like the Cygolite, but moves the cutoff up to about 10 feet above the low beam cutoff.

The Flux on high power-low beam puts out more light than either of the other two and would be passable as a motorcycle headlight.

The Flux on high power-high beam is comparable to an average automotive high beam.

On both high, and low power-low beam the glare is actually a little less than the Luxos, probably because the Fluxes lens is wide and narrow where as the Luxos has a fairly tall and wide lens.

On both high, and low power-high beam the glare is rather intense, not as "hot' a glare as the Cygolite, but spreads the glare wider.

At $275 its darn expensive, but the quality and function is there. Without a doubt its a true, dual beam "headlight" and I haven't seen another light that can match it in that respect.

It looks like the upcoming week will be wet, which will put the light to the test.