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TG, a sharp, focused beam is need to signal and to look down corridors
and other spaces, whether they be ship of cave. The signalling is the
most important. With a flood beam, you can not see the movement of the
light. Since the human eye detects movement, creating movement is
everything in signalling.

Really suprising is the degree of effectiveness in open water in the
ocean, especially as you get deeper. We use them to scooter apart and
stay in contact even in the great vis down here in full daylight, and to
signal in all dives. 

I think it is important to have gear and a rig that will go with you as
you do different dives. I wish I had found out about cave lights or
wreck lights prior to purchaing several of the hand held lights and
wasting my money.

Ted Green wrote:
> 
> > Date:          Wed, 02 Dec 1998 19:36:27 -0500
> > From:          KVI <kirvine@sa*.ne*>
> > Subject:       Re: techdiver arguments
> 
>   George,
>       For those of us who have never dove in caves, please explain to
> us this "signalling" that requires a focusable light. Does this
> require a black environment with walls, or is it also applicable to
> diving where the sun is the primary light source and a dive light is
> used to look under wreckage etc..
> 
> Ted
> 
> >
> > The light is bullshit - why have a clunky, non-focusable light ( useless
> > as a signalling device) or for looking distances that hangs off of you
> > danging or is a weight in your hand that you can not use and use your
> > hand at the same time. All the parts of the lights are replaceable in an
> > instant, and the small ones burn 40-60 minutes - enough for a wreck
> > dive. We use backup lights on the harness that are twist on 3- C cell.
> >
> 
> Ted Green (Owner)
> Tidewater Aquatics (Dive Store)
> Salisbury Maryland USA
> Master Instructor SSI #178
> Trimix Instructor TDI #029

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