The NiteRider Pro 1800 is the highest scoring bike light we've tested. We give it a 10 out of 10 for its beam pattern and brightness. It had the evenest beam and by far the greatest maximum distance (a whopping 172 meters) of all 20 lights tested. This is our favorite light for mountain biking, since the brightness and battery life make it unmatched for long trail rides. Unfortunately, its large size, heavyweight and time consuming installation, make it ill-suited to commuting unless you really need a super bright light for safety, or have an unusually long commute. For most commuting situations, our testers in four U.S. cities much preferred a more compact lights with integrated batteries. But, if you wants a powerful light that rivals some car headlights, look no further.
If you're looking for more of a balance between a powerful light that is still easy to remove, charge and is much less expensive, we recommend the Cygolite Expilion 800, our Editors' Choice award winner.