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The correct way to solve this is to go with the EE HID. It cuts through shitty viz like a light sabre and increases your burn time to more than you will need. Trout > -----Original Message----- > From: Jeff Disler [mailto:pdisler@io*.ne*] > Sent: Tuesday, May 09, 2000 9:54 AM > To: Tomsits; cavers@cavers.com > Subject: Re: another stupid question..LOL > > > Tom, > > I agree, if one is not mentally prepared for a silt out, they > should not be > cave diving. > I suppose some people who were not totally prepared to negotiate > passage in > 0 vis might gain a since of comfort from the warm glow and primary would > offer. > > But one also needs to understand that, > all caves are not created equal. > Some caves are in a near constant state of silt out or low vis and do not > warrant the use of a 50 watt or even a 35 watt primary. > > My choice of a 12-20 watt lamp is not advocating that it is right > for caves > with 20-50-100' of vis. But for low to no vis systems it is the > right light > for my purpose. I need the burn time over brightness, in low vis > sumps a 50 > watt bulb and huge cannister are not needed and in fact are usless,(can't > see in 0 to 10' of water any better with 50 watts than with 12 watts) so I > don't bring them. > Referencing the cave in low vis means doing so with all the > available means > under these conditions. This can mean see what can be seen > (pretty cave and > all) as well as be felt (negotiate by feel). > > Obviously in clear water a high wattage lamp will give more available > visual input, so as not to miss jumps, landmarks, and features in > general. > Not so obvious leads (going passage) often can not been seen ( 50 watts or > not) unless you crawl right up to them and check them. > > I'm sure no one would recommend the use of a 50 watt light with a > cannister > for low vis conditions (I might be wrong). That would be bringing > something for the sake of bringing it. > Groping the way forward is the most effective way to explore many caves > (I've tried to think it through) because more often than not, > > Silt Happens > Regards JD > > > > At 06:27 AM 05/08/2000 -0400, Tomsits wrote: > >Jeff, > > > >First off, if anyone is not mentally prepared for a silt out then they > >should not be cave diving. > > > >Second... Why advocate using improper gear. A 12 Watt primary light is > >useless. You loose visual definition and clarity (The cave don't look so > >pretty and you can get lost:)). The ability to distinguish > features may be > >the difference between proper referencing and missing a jump. > You would be > >amazed at what you missed by using a 12W light. Use a 50W BRL > bulb and see > >the difference. > > > >Third... (Assuming your diving with proper gear) You are right. Never > >turn off your primary during a dive. The chances of the bulb filament > >breaking during cool down or start up is very high leaving you with the > >need to exit the cave with no primary. This would turn a minor > >inconvenience into a more stressful situation. > > > >Be cave divers and think these things through. That's the difference > >between DIR and personal preference. - JT > > > > > >At 12:52 AM 5/9/2000 -0500, Jeff Disler wrote: > >>At 06:47 PM 05/07/2000 -0400, Mark Hanes wrote: > >>>OK here goes.... > >>> > >>>If you are poking around in small silty restrictions and find yourself > >>>in a white out situation...would it be better to keep your > eyes open or > >>>closed from a psycological standpoint?? > >>> > >>>I always close my eyes as this doesnt let me know I cant see..and I > >>>think helps me to concentrate on the line without the mental > turmoil... > >>> what do you think?? > >> > >>When I'm diving under these type conditions, I will usually > just shut off > >>my light and leave my eyes open. This assuming that one already > knows the > >>direction of travel and are on the line heading in their > desired direction. > >> > >>Of course if the vis is not truely zereoed, then some navigational > >>information could be missed by either closing your eyes or shutting down > >>the primary. > >> > >>Why have my light on when it not usable, I'd just might as well save the > >>battery power for when and if the conditions clear (I'll check > from time to > >>time) or beyond the sumps. > >>I have heard many suggest that shutting down a primary light > during a cave > >>dive is not a wise thing to do. It is true that powering up a bulb is > >>probably the most likely time to have a bulb failure. Perhaps the higher > >>wattage bulbs used by some have a greater chance of bulb failure during > >>start up. I however usually only dive with a 12 or 20 watt bulb and have > >>never had one blow during switching on. > >> > >>Regards JD > >> > >> > >> > >> > >> > >>"SILT HAPPENS"JD JEFF DISLER > >> SAFE CAVING NSS 26000 > >> > > > > > > > "SILT HAPPENS"JD JEFF DISLER > SAFE CAVING NSS 26000 >
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