(NOTE: Repost from My Bike Lights Thread)
HOLY %$#@!!! Got a rare chance to go back underground at work today and so I decided to take my modded BT40S bike light and new battery pack to test it out. WOW! I actually pulled our site "tour guide" (can't think what to call him - the young guy that took us to our destination wearing a +/- 150 lumen XR-E type miner's cap lamp) over and said, "Hey, you wanna see something that'll make you crap your pants?" Afterwards I then explained how I only have about $35 in that light to get that insane output.
Pics: (Click pics for larger versions. Also ignore traffic cone which only served for my partner to be able to see that location during his setup.)
Here's a pic of my BT40S on "Turbo" (+/- 3.8A):
I'll skip the other modes and just show you "Low":
Another random photo looking the other direction at my coworker using one of my headlamps to get setup to work through a doorway.
Later on I took a photo using an aspheric flashlight (Zuesray +/-1,000 lumens) lighting up that whole wall (slightly different angle but same area as above pic).
-Garry