thanks for the excellent find and pre tour advice.
for those considering the trip, cosmo's descriptions are spot on and his photographs far surpass my own. crawling into the manhole was definitely a treat. bob diamond was a great guide and the tunnel is obviously a source of pride and good fortune. the end was a little rushed since we spent about 2 hours underground and there was a second group waiting on the sidewalk.
on to the lights!
while standing on line outside, i spent time identifying the lights people were carrying as they approached. there were the requisite mags, 99 cent plastic c/d cell lights, multi led showerheads and a red anglelux. a few carried headlamps that appeared to be petzls. nothing screamed insane person willing to spend hundreds or thousands of dollars on handheld lights.
for myself, i brought a cr2 ion, an altin draco, an old school surefire u2 w/donut hole and a jetbeam m1x w/life preserver hole. the cr2 ion stayed in my bag as it's attached to my keys and i didn't want to chance losing them. i tried the draco a few times and it was among the brighter lights but the tunnel was quite long and dark so i quickly put it away for something with more throw. the u2 got the most use. i'd set it to low when we stopped for a bit of history and cranked it up to highlight a feature and for walking. it was dark but 2/3 or 3/4 of the tunnel was lit by a string of incandescent lightbulbs. one could survive without a light on the tour considering the 100 or so other people milling around.
as far as the m1x, it was beasty. the thing was brighter than all other lights combined and i felt almost silly when it was turned on. the tunnel could still swallow it up eventually but the effect of its output was certainly dramatic. it took me some time to realize that i needed to stand in front of the group so as not to waste my time illuminating the back of people's heads. i didn't hear any comments about how ridiculously bright the m1x was or any complaints about spoiling the atmosphere. honestly, i don't think anyone cared enough to be impressed.
if you're going to go -
bring a medium light for when bob is talking and something brighter to use briefly as you move down the tunnel.
do not wear anything you mind getting dirty. there's sand, dirt and dusty air down there.
practice taking low light pictures if you're going to bring a camera.
bring a jacket. it was actually about as cold underground as it was outside today (low 50s).
i hope other cpf members notice this thread as i'd love to hear more experiences. i wish cpf had a dedicated forum for these types of stories as it's tough to sift through the endless posts about buying suggestions for a true gem such as this. the tour is a must see for anyone in new york that wants a legit use for their flashlights and an intriguing bit of history for regular inhabitants.