I have two BIG dogs that I walk over 2 miles every night, so I've spent some time looking into this issue. I agree with that others have stated about separating your signaling light from your main carry light. I wear a reflective baseball cap with a
Guardian LED clipped to the back. The advantage of the Guardian is that it has a big dome that allows it to be seen from a wide angle. It is bright and has both continuous and flashing modes. It is also very light and the clip stays where you put it. On the front of the hat, I have clipped a generic
5 LED Cap Light. This generates a reasonable about of light which is good for "poop duty" without completely ruining your night vision. It also has a simple, easily accessible on-off switch can be activated as you approach intersections or need to quickly check that low-hanging branch. Never underestimate the convenience of having a hands-free light when dealing with dogs.
Or, you could do all of it at once with the
Panthervision Lighted Cap. I picked one of these up at SHOT Show 2007. However, I have not seen any retail outlet for the version that I have which has 6 front-facing white LEDs and one rear-facing red LED. The multifunction interface is both a blessing and a curse as it allows you to select a number of different light and flash modes, but it is not easy to just turn the light on and off while leaving the rear LED flashing.
My primary carry light until this week has been a
TigerLight with a premium battery and generation 3 bulb. This thing puts out an amazing amount of light and is built solid. I've wrapped it with some reflective tape that I picked up at Smith & Edwards in Ogden, Utah. However, last week I got my
P3D Rebel 100 from the Fenix-Store. I love the interface and brightness of this light. It starts out on low which is perfect for signaling, but can easily be stepped up to 100 lumens should you need more light. I wish Fenix made a traffic cone for this light which would make it ideal for this use.
My dog does wear a reflective collar, but I wear all the lighted stuff so that I can insure that it is facing the right direction at the right time. With the hat lights, a simple turn of the head can put light where you want it without releasing your grip on the leash. Additionally, the high placement of the hat light avoids it from being blocked by landscaping and will be seen earlier by a driver than a lower-placed light or leash.
I could go on about reflective clothing and flashing vests, but I don't want to bore you too much.
Stay safe.
Craig.