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Re: [PSUBS-MAILIST] SeaBlaze3 LED bench test



If it's so well sealed that it can't be modified what about a 12V outdoor floodlight?
They would have a degree of weather resistance & may be suitable for oil compensation.
This one is only $24- probably half the lumens of your light & not so costly to experiment with.
http://www.google.co.nz/imgres?imgurl=http://i00.i.aliimg.com/img/pb/558/526/379/379526558_309.jpg&imgrefurl=http://www.aliexpress.com/store/903096/211021261-523123838/10w-outdoor-led-floodlight-warm-white-LED-Round-Floodlight-12v---Free-Shipping.html&usg=__dAH9YVFzTcggjUEzley7FIJ6jd0=&h=623&w=600&sz=48&hl=en&start=38&zoom=1&tbnid=skpo1C1Th3BxvM:&tbnh=136&tbnw=131&ei=x-EUT5X6CYSSiAfTwrAw&prev=/search%3Fq%3Doutdoor%2Bled%2Bfloodlight%2B12v%26start%3D21%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN%26gbv%3D2%26tbm%3Disch&um=1&itbs=1
Regards Alan
----- Original Message -----
Sent: Tuesday, January 17, 2012 3:18 PM
Subject: Re: [PSUBS-MAILIST] SeaBlaze3 LED bench test

Possibly but the anadized case is sealed so it would be hard to drill and tap without knowing where the internal electronics are located.
Cliff

 
From: "ojaivalleybeefarm @dslextreme.com" <ojaivalleybeefarm@dslextreme.com>
To: personal_submersibles@psubs.org
Sent: Monday, January 16, 2012 7:48 PM
Subject: Re: [PSUBS-MAILIST] SeaBlaze3 LED bench test

Hi Cliff,    Maybe you could fill it with mineral oil.   Fast turn around on your video !
 
Brian

On Mon, Jan 16, 2012 at 4:54 PM, Cliff Redus <cliffordredus@sbcglobal.net> wrote:
Psub postings have been a bit slow so I have decided to post a short test I did today on an off the shelf LED light.  Subsea lights are very expensive for psub applications so I was looking to see what kind of depth performance I could get with an off-the-shelf LED marine light for pleasure boats.  I chose to test the Lumitec SeaBlaze3.  See the YouTube clip of the test at    http://youtu.be/WXYPjIgoxLE .  Prior to the test, I took it to swimming pool to see how it worked at night. The light worked great and very bright.  You could see across a an Olympic sized swimming pool without any problem with just one of these lights.  The application I am contemplating would use seven of these lights working off 24 VDC.  The lights will work on 10-30 VDC.  For 24 VDC, they pull 1.1 amps.   To conduct the test, I built a pressure chamber out of 4 inch, schedule 40 galvanized pipe fittings. I then made up a simple electrical penetrator using a ¾ inch pipe fitting, nails and some two-part epoxy.  To pressurize the test chamber, I used my pressure washer with a bypass valve.  To determine when the unit failed, I connected the light through the DC current section of my multimeter.  Because the line pressure for my house during the test was 74 psig, this is the minimum pressure point for the test. 
Results were that the LED light worked fine for about 4 minutes at 74 psig or 167 fsw.  At that point, the case flooded.  The application I am looking at has a 500 fsw design depth with a max test depth of 625 fsw.  Therefore out of the box these would not work but it would be straight forward to  pull the electronics and LEDS and  insert them in a custom 1-atm shell.  This lights was $220. 
 The reason I thought this had a chance of handling the pressure was because the case is anodized aluminum and the lens is glass. The LED face plate was in contact with the lens so structurally it was being supported.  My guess is that they must have used some kind of adhesive to seal the lens rather than an o-ring.  My next step is to tear the fixture apart and see if the electronics and LED could be repackaged for pressure.
 
Cliff