Originally Posted by
mrbubbles
For practicality, I made this 4 years ago, there wasn't any 600 lumen lights for dynamos that readily available 4 years ago, and I agree with you that near bright spots are very undesirable, and my setup does not have that, the optics can be changed. Riding besides a Edelux or any of the commercially available light in the 200 lumen range, this puts out more light.
First, let me apologize for my earlier post. A more detailed review of your reference cite reveals that it wasn't as ridiculous as I first thought, though I do find the conclusions without adequate support.
Dynamo lights are not typically rated in lumens for a reason. The measurement is not useful and mostly an artifact of marketing. The lux ratings occur at a fixed distance from the light source (I believe 10 meters) on the ground in front of the light source. Using this the EDELUX is a 60 lux light (I believe), the most common are 40 lux (of which I have one and it meets/exceeds the brightness of my 400 lumen cygolite, with a better pattern). And I have recently also purchased a Luxos B which is rated at 70 lux and is brighter (with a much better light shape) then 800+ lumen commercial battery powered lights I have used.
The better dynamo lights publish a light chart that shows lux rating and light shape over a two dimensional space in front of the light.