Use common sense, beware of drop offs. Carbide lights are the best light source. Chambers from brass or plastic. The control stem drops the water, gas goes through the filter.
Electric lights fail, too much humidity.
Green is the best, blue and red are available. Spelunkers won't tell you about caves unless you look like a spelunker. Knee pads essential. Metal rusts quickly in a cave. Bring spare tips and cleaning wire as tips burn out, always carry three spare tips.