Thx ladies for adding onto this thread. I'm still mulling over the the NiteRider lights.

I ended up going with two lights thus far, pros and cons to both. I got the HID L&M w/the cub ion battery for less $, and less run time trade off. Wow, is it bright. But, I think I don't like the weight of the lamp on my helmet. It's a beautiful product, don't get me wrong, but I have some neck/back disc issues and I can see it bothering me in this position after a while. Bar mount is ok.

I like the idea of the NiteRiders as they appear lighter (meaning more of a practical helmet solution in my case). I have a smaller multi-mount commuter light I bought off TE. It's pretty bright for the price, but not a HID obviously. I like it's lightness on my helmet, but recently used it camping and it's not bright enough in pitch black. Example: spinning the camp roads with fires burning = ok... traveling a cut through path between camp sections that's wooded, no external light except stars = not ok.

Also, I now understand what someone means about "making the light go where you need it". With bar mount, I found it bothersome in trying to turn my head to see and I could not. Like for a wild animal road side, dog, etc.

I wouldn't want to think too much about tipping my head down not to blind drivers with a HID on my helmet, so... I think I will do a combo as days shorten. HID on the bars, and lesser light on the helmet for the quick head turn. I've been doing more trail riding lately, and there obviously you don't have the issue of cars. I can see a bright helmount mount working there ok. For me, it's just needs to be pretty weight/light.