[sixthblade]

Yes - have one in my pocket.

I have found that you get a whole array of amazing colours when flashing a light at a coral head - even in daylight. You tend to miss those if you don't have one!

Also - you never know when cool / interesting dive throughs may be available - and having a light helps to figure out what's ahead, etc., etc.

Finally - once you are on the surface - it could be used as a beacon device to attract attention if necessary.