Um, how are you generating this stroke?
stroke > generate
or any other method feel free to make suggestions
attaching a light to be used as an emitter isn't difficult. Just copy the path and paste it to the light's position property. The only hard part is matching the exact position of the end of the stroked path. As long as the keyframe interpolation is constant and easy ease for both percentage of stroke and position the match will be exact. Other than that, you'll have to set the speed curves manually.
thanks very much--
that is in fact what I ended up doing, and getting the intermediate timing to a close match wasn't terribly difficult--although it did take some tweaking;