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On the 600 attempt, I took my Mini Mag Lite (single AAA version) which I can hold in my mouth and shine into my saddle pack while I try and dig out spare batteries for the rear light (again and again). :) Problem with using a torch is that it's not on whilst riding so you lose that 'see where you're going around bends' benefit.
Really? I thought the Exposure Revo was super duper bright but just not quite as focused as the German road-specific options?
The helmet mounted light is a good idea for all the reasons you stated, the dynamo light is useless when stopped. It is also pretty pants on a hairpin road I use quite a lot as it doesn't shine around the corner! However I would beware Shermer's neck, as the added weight is in exactly the wrong place, and it was the helmet mounted bluetooth intercom that did it for the rider I was supporting in the race around ireland last year. Use a tiny torch (I have a Sunwayman VR11) It has about 500 lumens and is easy to click on when needed. The output is adjustable, so when faffing about off the bike you can turn it right down low to save the battery and your night vision.
Comparing dynamo lights I also have an ordinary Supernova E3 (useless, now a town bike light) and an Edelux (also useless as the cutoff beam is just where you need the light to be). E3 Triple pro gets my vote, although my mate has the Exposure revo, and I like the beam pattern of that. Just not as bright though.