I have read this thread with interest since I am thinking about getting the 600L as a supplement/backup for my Wilma headlight. My commute is mostly on unlit MUP and I would mount the 600L on the bar. Having 2 lights I do not have to worry about how many hours I have on a charge. I was also thinking about the Dinotte 140140L-AA-A amber light to be seen when the MUP is snow bound and I commute on the roads. Wanting greater flexibility, I was thinking about putting a amber filter in front of the 600L and using it on flash like the 140L-AA-A? What is the outside diameter of the 600L? Does anyone know if there are photographic filters that might fit or be attached to the light or flipped down over the light?