http://goo.gl/n3xhD
Acknowledging that I couldn't possibly maintain a list of all headlamps or even all headlamps that get used by cavers, the list is limited to those that meet a few conditions...
The guidelines:
Proven - to be considered for this list multiple cave explorers must report that they happily and regularly use the model in question as their main light.
Bright - headlamps producing less than 200 lumens will not be considered.
Available - only non-generic headlamps with proper model identification which are currently readily available on the English language mail-order market will be considered.
The first version of this list was written in October of 2012 and posted on several small caving forums/groups. By the end of the year it had been shared (by me or others) on nearly a dozen websites and online groups. I have already received feedback and corrections from explorers, distributors, and manufacturers as far away as Croatia, New Zealand, England, and Switzerland. I welcome feedback, suggestions, and corrections! (Replying to this thread should be just as effective as emailing me directly.)
This list is not meant to endorse any one lamp or manufacturer, nor does it claim to contain sufficient information for deciding on the best model for you - it is only intended as a starting point for someone researching the current caving headlamp market.
If link-shorteners scare you (and perhaps they should) then this is the full long format link:
https://docs.google.com/spreadsheet/ccc?key=0Aq_1dPxvBnXUdHZTckszcW1kcXZoSGh0OUhiYWdxX3c