http://www.treehugger.com/gulf-oil-spill-PC-in-dive-gear.jpg
While not a practical caving headlamp, it does show how you
can borrow ideas from other activities that use LED headlamps.
The only other headlamp I know of that has 4 luxeon type LED's
is the old FoxFury Pro that has been around for several years:
http://www.foxfury.com/products/pro_series/images/pro_fire.jpg
The most practical way to get 4 LED's that bright on your helmet
is to mount 2 Stenlights, but that could set you back $ 740.
On the subject of Stenlights,
There are only 4 vendors now that sell them. Over a year ago, Stenlight
upgraded the LED modules, calling it a Stenlight Premium model.
That is only $ 370, plus $ 10 for a frosted lens if you want that, which
supposedly improves the light pattern.
I have to at least mention that if brightness is what you are after
and you have the money, Scurion has upgraded its LED module too:
http://www.scurion.ch/jm/index.php?option=com_content&view=article&id=140&Itemid=92&lang=en
David Locklear
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