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The effect of light backscatter in low vis is a function of suspended particle size and angle of incident light - not of light intensity. True, a higher wattage light will produce more backscatter, but the effect of an intensity change (as noticed by the diver) is negligible compared to change in beam focus or suspension density. The AUL 14 is a good light. I'm currently using a similar light that I created myself (closer to Gavin in design), but the key is to have good control over beam focus, and to position the light head in a manner so as to reduce scatter. Generally, positioning the light head forward and at an oblique to your line of sight will minimize this problem. I dive frequently in zero to minimal visibility conditions, and occasionally prefer a higher wattage bulb, depending on the dive objective. -Sean On Tue, 25 Mar 1997 17:53:38 -0800, Kevin Connell wrote: > >For those of you not diving in 300' vis, like me, I'm looking at getting a >"real" primary light, probably the AUL 14. I admittedly haven't used a >light bigger than 15W... > > My question is, does the back scatter from, say, 15-20' vis become really >bad with a 50W light, and if so, is it better to go with a lower wattage >bulb? If not, is the AUL 14 "focusable" enough to cut through bad vis >rather than create a white wall of light? > >Thanks in advance. > > > > > > >-------------------------------------------------------------------------- >Kevin Connell <kevin@nw*.co*> > >Northwest Labor Systems >http://www.nwls.com >Bellingham, WA >--------------------------------------------------------------------------- >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send list subscription requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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