The front Ultrafazer 3.0 packs quite a punch considering it's just three LEDs powered by two AA batteries.
It gives off an impressive puddle of light, just enough to ride with but with good visibility thanks to the LED arrangement and the side 'window' on the body of the light. It is also waterproof to 50 metres - untested, as we don't have 50-metre deep buckets - aided by the magnetic switch on the rear. The mounting is a tool-free design that's reasonably easy to install, and it is accompanied by a good little rear light. The TL 5.0 uses three large LEDs and two smaller ones pointing out to the sides.
The clamp for the seatpost requires a screwdriver to fit, but the light body itself has a clip for hooking on your bag or jacket. They're both very well sealed and offer fantastic performance.