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Be careful, you'll find you get very little shadow on dips in the road so can't see potholes etc as clearly.
hamrack-
Yes I've read here about it. There's about 7cm of difference between fork position and actual handlebar position, don't think its making so much difference on shadow casting since I didn't have any problems detecting potholes on the 400/600/1000 brevets. Anyway on important descents I'm using a helmet light to be more confident. I might get it back to the fork just to try out some small handlebar bags
Edit: I think the pothole shadow problem is not so important here in Spain on most roads, because most of our roads are not pitch-black, but a tone of grey. I remember @CarlosBI telling me that riding at night over wet black asphalt its like riding without lights... you can't see a thing! from his TransAm experience, and the roads around his home at Basque Country. I still need to do some practical tests, I remember two new roads that are black and I couldn't see much but knowing they were recently paved I wasn't fearing any obstacle, but on other really old ones I could even ride without a light... just with moon's light was enough
bertocq
Instructions advice not to install lights upside down, but here there is little to no rain on summer, and I'm not riding at night on winter. That home silicone could work since cable entries have already a nice seal.
Anyway the whole point of doing this was to:
1- Get light closer to me, to be able to point it up/down easier if I was blinding oncoming traffic (no car flashed me to complain about it)
2- Get light higher to avoid creating a shadow with the front tire.
But the only good reason to do so, is if your fork doesn't have a hole to install it (most disc only forks doesn't) Also it prevented me from trying to use an small handlebar bag.