munkispank
Contributor
I think the implication is that often for cavern dives, they do not allow you to take lights with you (Ginnie etc) because the temptation to venture beyond the limits of OW would be too great (presumably). So it is a privaledge to be able to carry a light at devils den- although personally I didn't rate the dive- of the options, I would go for Ginnie cos, as Andy says, you have several dive options in one- and its a nice place for a picnic.