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tgunther@co*.co* wrote:

> All:
>
> Why two backup lights and not one?   Between these and the canister that makes
> three.    Isn't three a bit of an overkill?

Three is the standard for wreck diving involving penetration, cave diving, and I
believe dry caving.

Unlike most of the components that we use, which are very reliable, lights are
not
very reliable at all.  So unlike most life critical systems in diving, where
full
redundancy is considered sufficient, lights have triple redundancy.

Of course, if your light is not necessary, leave it behind.  If it is necessary
for enjoyment of the dive (e.g. for poking into holes), but not necessary for
safe
completion of the dive, taking one light is just fine.

But in most low or no ambient light situations, take three.  (Braille dives are
an
exception - take none!)

Wrolf
http://wrolf.net


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