[PSUBS-MAILIST] LED lights

Sun May 17 17:12:00 EDT 2015

Brian,
I have sealed housings with up to 400W AC halogen lights, they work just fine under water.  No need to add cooling.  I can not turn them on dry because they get SOOOO hot.
Hank--------------------------------------------
On Sun, 5/17/15, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] LED lights
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Sunday, May 17, 2015, 5:05 PM

 Would it be practical to
 flood the led compartment with mineral oil to dissipate
 heat? Brian

 --- personal_submersibles at psubs.org wrote:

 From: Hugh Fulton via
 Personal_Submersibles
 <personal_submersibles at psubs.org>
 To:
 "'Personal Submersibles General
 Discussion'"
 <personal_submersibles at psubs.org>
 Subject: Re: [PSUBS-MAILIST] LED lights
 Date: Sun, 17 May 2015 17:53:25 +1200

 That light looks very
 nice.Pretty sure mine are not Cree.  No name on them. 
 My lenses are glass.Calcs to 500 meters plus but have not tested yet. 
 After 10 minutes in air they get pretty warm but in water
 they are fine.Hugh. From: Personal_Submersibles
 [mailto:personal_submersibles-bounces at psubs.org] On
 Behalf Of Cliff Redus via Personal_Submersibles
 Sent: Sunday, 17 May 2015 6:11 a.m.
 To: Personal Submersibles General
 Discussion
 Subject: Re:
 [PSUBS-MAILIST] LED
 lights Your
 design looks great. Yes we should, we should compare
 notes.   What is the overall dimension of your  two
 lights?  How many Lumens do the 50 and 150 watt lights
 make.  Are they Cree or Bridgelux LEDs? 
  I
 mentored some mechanical engineering students on LED light
 we developed.  Below is an expanded
 view.  
 The main body housing where the fins are is 2
 in OD.  These lights were made to run off  my 36 VDC main
 battery bank.  The custom PCB gives, a constant current to
 the LED as the battery voltage drops as well as reverse
 polarity and over current protection.  The body is 6061-T6
 aluminum that has been anodized.  They pull a little over 1
 amp of current and put out a little over 5000 lumen with a
 power consumption of 30W.  We originally had 3/8 x
 2"OD flat acrylic lens but have since switched to a
 borosilicate glass lens of the same dimensions that will
 give us more depth, better dimensional stability and better
 scratch resistance.  Team successfully tested the light in
 a pressure and temperature controlled test chamber down to
 750 fsw.  Light can run even when not submerged though it
 does get hotter.  I am in the process of fitting four of
 these on the R300 and seven on the R500 that I am
 designing. For
 future work, I would like to take the 10,000 lumen LED light
 that Scott Waters has recently installed in a 1-atm housing
 on Trusworthy and scale this housing up to fit this
 LED. I would
 like to get a closer look at your when I am in New Zealand
 latter this year if we can make that
 happen. Regards Cliff
    From: Hugh Fulton via Personal_Submersibles
 <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General
 Discussion' <personal_submersibles at psubs.org>

 Sent: Saturday, May 16, 2015 1:19
 AM
 Subject: Re: [PSUBS-MAILIST] Fw:
 DOSITS: Forward Looking Sonar Cliff,
 What is the LED housing you did?  I did one as well 50
 watts and 150 watts.  Should compare notes. Kind
 regards,Hugh
  From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
 On Behalf Of Cliff Redus via Personal_Submersibles
 Sent: Saturday, 16 May 2015 7:33 a.m.
 To: Personal Submersibles General
 Discussion
 Subject: Re:
 [PSUBS-MAILIST] Fw: DOSITS: Forward Looking
 Sonar Still
 not convinced these transducers need to be protected from
 pressure.  I have a small test chamber I built to test my
 new LED housing.  I may pop the DST800 in and do some
 testing.  I am pretty sure the DST800 is fully potted and
 such, now where for water to go. Cliff  
   From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General
 Discussion <personal_submersibles at psubs.org>

 Sent: Friday, May 15, 2015 2:14
 PM
 Subject: Re: [PSUBS-MAILIST] Fw:
 DOSITS: Forward Looking Sonar Cliff,
 Scott,I was
 looking at the panoptix forward scanning sonar from
 Garminhttp://sites.garmin.com/en-US/panoptix/&
 the Simrad 2D forward scan. Neither the N.Z. expert for
 Simrad orthe
 Australasian manager for Garmin could tell me about the
 transducersconstruction & were dubious about
 their ability to withstand 250
 psi.I would
 probably want it to be pressure resistant to 500 psi (twice
 operating depth)The
 Simrad is about $700 & the Garmin about $1500 so
 don't want to
 experiment.The
 Simrad expert was also unsure of the 2D models ability to
 shoot throughfiberglass & operate effectively.
 These are mounted vertically so couldn't in
 normalboating
 applications be mounted inside the hull due to hull
 shape. 
  The Simrad transducers are designed at theTulsa Navaco
 office in Oklahoma. That's just across the border from
 you Cliff. An alternative to the fibreglass
 plateI
 suggested may be to pot the whole unit up to 1/2" thick
 in fiberglass & fix it
 tothe
 hull with o-rings around the electrical through
 hull.I had a
 look at your DST800 Cliff. It has a paddle wheel in it. How
 deep will thepaddle
 wheel go before water will push through it's seal &
 into it's
 electronics??cheers,
 Alan 
 Sent from my iPad 
 On 16/05/2015, at 1:53 am, Cliff Redus via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:Alan, I
 am not sure packaging a fish finder sounder transducer in a
 1-atm pod is necessary for 500ft.  My guess is most of
 these are fully potted and cab take the pressure. 
  BTW, I
 am implementing a Airmar DST800 DST800 —Thru-Hull, Smart™ Sensor - Airmar
 Marine Transducers part of my R300 upgrade.  This
 sensor will give me altitude, speed and water temp.  The
 sensor sends out a NMEA 0183 ASCII sentence string that I
 will connect via RS232 serial feed into a coprocessor on
 my PLC.  I then can parse the string to get data.  I am
 using the same coprocessor so parse another transducer that
 gives me roll, pitch and heading.  This transducer is
 packaged in a custom 1-atm anodized aluminum
 housing. I
 looked at ROV sounders but these are expensive at
 $1500-$4000 each where these fish finder sounders are
 cheap.   Cliff 
 Cliff Redus
 Redus
 Engineering
 USA mobile:  830-931-1280
 cliffordredus at sbcglobal.com
  From: Alan James via Personal_Submersibles
 <personal_submersibles at psubs.org>
 To: Personal Submersibles General
 Discussion <personal_submersibles at psubs.org>

 Sent: Friday, May 15, 2015 4:41
 AM
 Subject: Re: [PSUBS-MAILIST] Fw:
 DOSITS: Forward Looking Sonar Have
 just come back from the local boat show after talking to a
 couple ofexhibitors about sonar / depth
 sounders.I am
 still finding my way here. Was told I could mount a forward
 looking sonar insidea
 fiberglass hull & would loose about 15% of my range as
 apposed to in water
 mounting.They
 said the depth sounder worked better than the forward
 looking sonar through
 fiberglass.Why not
 have a small view port type arrangement in the bottom or up
 front of the submarinewith a
 fiberglass plate in it. Then glue the transducer to
 that.For a
 3" diameter fiberglass plate .55" thick, I get a
 4000ft crush depth. Safety factor of 4
 forplastics I think, so 500ft capable
 operating depth.Quote
 from installation pdfs
 below......As an
 alternative to transom mounting, it is possible on
 manyfiberglass-hulled boats to glue the
 transducer on the inside
 ofthe
 boat hull. Since fiberglass has similar
 sonarcharacteristics as water, the sonar
 signal can pass throughthe
 boat hull with minimal loss. The hull of the boat must
 besingle
 layer construction (not double-hulled) Also, any
 airtrapped
 in the lamination of the fiberglass would prevent
 thesonar
 signal from passing
 through.Inside
 the hull installations require no holes be drilled into
 theboat
 and through experimentation, high-speed
 operationcomparable to transom mounting can be
 achieved. Two-partslow
 cure epoxy (not included) is required to glue the transducer
 in place.......In-hull: Installed against the inside of the
 hull bottom, the in-hull transducer sends its signal through
 the hull. “Shoot through hull” transducers do not need
 direct water contact. They’re glued to the inside of the
 hull with silicone or epoxy. An in-hull transducer is a good
 choice for a trailered boat, a vessel with a stepped hull,
 and for other types of high performance hull designs, as
 there is no drag, hull penetration or potential for fouling.
 No integrated temperature sensor. Can be installed while
 boat is in the water. For deadrise angles up to 30 degrees.
 As with thru-hulls, the selected location should be aft and
 close to the centerline so that the transducer is in the
 water at all times.In-hull transducers need solid
 fiberglass at the mounting location; no foam or plywood
 coring material, or air pockets. A typical 600W transducer
 can transmit through 1/2" to 5/8" (12-16mm) of
 fiberglass. To install inside a cored hull, find a location
 with no coring or remove the core material.Alan  From: Alan via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General
 Discussion <personal_submersibles at psubs.org>

 Sent: Monday, May 11, 2015 5:10
 AM
 Subject: Re: [PSUBS-MAILIST] Fw:
 DOSITS: Forward Looking Sonar
 Looks really nice Hank, but couldn't find a
 price.
 They are marketing to ship owners not
 recreational boat market.
 Had looked at
 other 3d forward scanners & they are quite a bit more
 than
 the Sinrad 2d.
 Alan 

 Sent from my iPad

 > On 11/05/2015, at 12:26
 am, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:
 > 
 > 
 > Alan,
 > Check this
 system out, you probably have seen it.  This would be very
 nice to have.
 > Hank
 >> --- On Sun, 5/10/15, hank pronk <hankpronk at live.ca>
 wrote:
 >> 
 >>
 From: hank pronk <hankpronk at live.ca>
 >> Subject: DOSITS: Forward Looking
 Sonar
 >> To: "hanker_20032000 at yahoo.ca"
 <hanker_20032000 at yahoo.ca>
 >> Received: Sunday, May 10, 2015, 8:25
 AM
 >> 
 >> 
 >> 
 >> http://www.dosits.org/technology/locatingobjectsusingsonar/forwardlookingsonar/
 >
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 > Personal_Submersibles mailing list
 > Personal_Submersibles at psubs.org
 > http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles 

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