The Planet Bike Turbo *IS* dim.
I run two lights at night, one steady, one flashing. Typically I'll run the Magicshine on steady on the rack, and the Cygolite Hotshot on my helmet on flash.
Running two rear lights is just sensible because you won't know if one of the lights goes out. Sure, I can see my lights reflected on street signs 1/2 mile back, but that only works reliably at night and on my route sometimes I go a mile between street signs. Also I have to remember to look and sometimes I'm busier dodging potholes than looking in my mirror looking to see if I can see the reflection from my taillights.
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Work: the 8 hours that separates bike rides.