I sort of have to take the bait on this one. I have tried routing my light cord both ways: over and under the "long hose." I really don't follow the logic behind putting it over the long hose.
You enter the water with the light clipped off. You deploy the light by slipping it under the long hose. If an gas sharing situation comes up, you deploy the long hose, and you don't have a possible high stress situation that will now also involve dealing with the light cord (which you would by having the light cord over the long hose).
Now, you are not going to be an idiot, and take your light and clip it off without remembering to first pass it under the long hose again. And, when you are going to clip off your light at that point, you are not in a high stress situation like you would be in a gas sharing situation. So, you take a second to remember to pass the light back under the long hose before clipping it to the right d-ring.
Doesn't this sound like it makes better sense?
BTW, I am a capitulating Weenie that deploys the light over the long hose like everyone else. However, I keep thinking about it, and I can't buy the logic proposed. I have tried it both ways, and I just don't think it's a problem to deploy the light under the long hose.