Although I have been using my home made 11K lumen head torch for a while now, last weekend I finally managed to take some photos underground for comparison purposes with a Wiseled Tactical and an Oldham candle.
The Oldham: (notice the dim yellow spot)
The Wiseled Tactical:
The Gloworm at 400lm:
The Gloworm at 1600lm (4x400lm):
The Gloworm at 11000lm:
A spot of post-processing in GIMP to bring out the detail.
The Oldham: (still pretty dim)
The Wiseled Tactical: (useful)
The Gloworm at 11000lm: (basically the entire chamber is illuminated which is how it appears when you're there)
For the full story:
http://www.cowdery.org.uk/gloworm.php http://www.cowdery.org.uk/gloworm-test.php Chris.
P.S. Mods - the preview doesn't seem to work for images..... But the submitted post does?