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In trying to decide what light I want to invest in. I am concerned about the IPX ratings for water resistance. What rating should I look for to be repelling or climbing in waterfalls or caving in very wet envirionments?

Ken, check out the table here:http://www.thehulltruth.com/jensen-marine-electronics/267442-water-resistant-vs-waterproof-ipx-ratings-explained.html

Beyond the IPX rating you have to consider whether the light will leak when it is struck hard by a rock. That's how I lost my last Apex was hitting a rock while it was wet which let water in passed the gasket.

Additionally, please take extra care while rappelling in waterfalls. http://www.accessnorthga.com/detail.php?n=236146

Thanks Phil for the great chart. I had looked at another chart that I found but it was kind of vague in it's descriptions. The chart you referred me to answered my questions completely. I made my decision and can't wait to get the new light on and feel like I can actually see what's going on around me. I will be graduating from a Black Diamond Icon.....I'm excited......