I use a Schmidt hub with a Solidlight that utilises the fact that Schmidt hubs put out 12v over 12mph so the second led comes in.
Because the Solidlights are LED they don't give the pool of light on the road but in dark country lanes they are brilliant giving a good overall flood of light.
Around town a Busch Muller 3watt Halogen might give you a better spot of light for seeing potholes etc
There are some new LED dynamo lights that are supposed to be brighter than the Solidlights but I have not seen them yet
I use a Schmidt hub with a Solidlight that utilises the fact that Schmidt hubs put out 12v over 12mph so the second led comes in.
Because the Solidlights are LED they don't give the pool of light on the road but in dark country lanes they are brilliant giving a good overall flood of light.
Around town a Busch Muller 3watt Halogen might give you a better spot of light for seeing potholes etc
There are some new LED dynamo lights that are supposed to be brighter than the Solidlights but I have not seen them yet
There is a good thread on light testing here on YACF
http://yacf.co.uk/forum/index.php?topic=11751.0
and here on AUK site
http://www.aukweb.net/lights/index.htm