Arrogant Safety Nanny
Join Date: Apr 2007
Location: Santa Maria, CA
Bikes: 2007 Trek 7.2 FX, 2008 Trek Madone 5.2
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I use a Fenix P3D which is pretty much a P2D with an extra battery. It is slightly brighter and has longer runtimes.
The tailcap switch is not as sensitive as a pocket calculator. It has a fairly normal feel for a "clicky" type switch, similar to any normal C or D cell mag lite switch. To change modes there isn't a click, just a soft touch on the end, but still more than the average pocket calculator would require. The front of the light also twists to alternate between the turbo (constant/strobe) and normal (low/med/hi/sos) modes. I always use turbo constant at night and strobe during the day. The light is mounted on my helmet with a Livestrong wristband and a rubber spacer from a blinky seatpost mount.
I use Tenergy 3.0v RCR123 900mAh batteries from www.all-battery.com
. Runtime is probably near 1 hr on turbo for the P3D, but I've never really done a runtime test and only ran the batteries down once (when I wasn't keeping track of how long they'd been in use...just running errands, and always carry spares so runtime isn't too much of a problem).
I always keep at least one spare set of lithium cr123 batteries (non-rechargeable) in my trunk bag. It is just as important as a spare tube, patch kit, pump, etc. They are supposed to have a 10 year shelf life. The Fenix PxD series is designed for lithium batteries only. They will not run on alkaline or NiMH batteries from what I understand.