I agree with what has been said but would like to add one valid point. If you've ever dove in the Caymans and been doing night dives then you would be aware that there are these worms that will collect around your dive lites in a manner that becomes like abunch of flies swirling around a pile of stink, times 1000. I've had those darn things obliterate my dive lites. The best thing one can do in a case like that is turn off the dive lite for a minute or two and scoot away from that particular area of the reef, even then you come to the realization that this will continue to happen. Think about having that lite perched on top of your head and then a thousand swimming worms congregating around your head.....and they will swim in your ears. There's no danger to them other than, your site will be obliterated for at least a minute, and your ears will tickle like crazy, they become a monstrous pest. , , , , And you WANT to put a light on your head?---your'e nuts!
Dive Safe,
Caymanaic