PDW DangerZone taillight using the "aha!" setting (crazy flashing punctuated by slow fades). Used largely in the rain morning & evening. I think the risk of getting hit by overtaking motorist is quite low, although it is a major worry for many cyclists. With the AAA taillights, you just have to watch the brightness of the light - the batteries tend to decline quite steeply.

I'm using a L&M Urban 300 on the front. At the second-brightest setting (150 lumens?) I still nearly had a darkly-dressed ped (sound familiar?) jaywalk in front of me this morning. When it's light enough that I can't see the pool of light on the road, I switch to the flash setting or just turn it off when the sun comes out. I keep a micro-USB cable plugged into my laptop at work just in case, but it usually only needs charging in the evening. It's really convenient that it recharges off the same cable as my droid phone, so I keep a micro-USB cable in the car as well, plugged into the lighter socket. I note that on my new Jetta, it's called a "12V" socket, and doesn't even come with a cigarette lighter, just a dummy plug!

Luis