I find the run time on high for the Phillips to be right about 50 minutes and 90 minutes on low, kind of short but it's using 4 AA rechargeable bats, so maybe once the bats go dead I can get larger amp hour bats to replace those with. I never ride longer then that at night anyway so it's not an issue for me.

I would not buy the dynamo version because the light output is about half of the Saferide 80. Also according to Peter White you can get a dynamo hub and recharge the Saferide 80 with it! See: http://www.peterwhitecycles.com/philips-bat.asp Also scan down that page and see another light show from the Phillips. Peter White is now liking this light over any of the dynamo lights that he has sold before.

And very recently Phillips released a rear tail light with 6 LED's that make the rear light up with a very bright ring effect using 6 very high powered led's that is claimed to be visible 360 degrees around the bike, and avoids the problem of a spot rear light. Initial reports are claiming that the light is the brightest tail light they have ever seen. As with all Phillips lights they are first introduced in Europe before coming here to the US, so far their not found here, but the beauty of the internet does away with that hassle. But I'm going to wait till I see comparison shots because I was thinking about the Light And Motion Vis 180 but now I may wait. The new Phillips light is called the Lumiring. I also just learned that so far this Phillips does not have a flashing mode, it's either on or off, some cyclist don't like that idea, but cars don't flash, and this light mimics a car tail light, also flashing tends to confuse distance judgement of people seeing them from behind. So probably if I get one I will combine it with a flasher.