An alternative to Lock Bloks for securing LED flashlights to bikes that I've found satisfactory are these from Meritline.com Unlike a lot of other mounts which are fragile or turn brittle, these are robust and seem UV resistant. Only concern is the shipping lead time.

http://www.meritline.com/showproduct...shlight-holder


http://www.meritline.com/360-degree-...--p-35024.aspx