Originally Posted by
deepakvrao
Would a Shimano dynamo hub and B&M headlight give as bright/brighter/dimmer light than say a Magicshine? or how would it be compared to a Dealextreme P7 flashlight?
No, it wont be as dramatic, but it can be as useful. There are many threads discussing this issue - the nice Bumm.de dynamo lights or the Edelux or the new Philips night light focus the light very well. The Magicshine is a powerhouse that uses an average reflector and a lot of power. That equivalent power isn't available from the dynamo, but this is made up for with very good optics from those three offerings and also the fact that the magicshine and other cheaper non-bike lights are symmetric output so immediately 1/2 of their claimed output is lost by going up where it does nothing to help you see the road.
You can get very good results with one of the Dealextreme lights, the best throw wont be achieved with the p7 but it depends on what you need. What type of riding are you doing? Mountain or road, what speeds, hills, raining? etc.