[PSUBS-MAILIST] LED light bar

Mon Jun 22 18:31:28 EDT 2015

Alan,
I think the one I saw was square?  sounds like heat is the big problem.  We sure got that covered, also humidity, well we got that covered also by submerging in oil.
Hank--------------------------------------------
On Mon, 6/22/15, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] LED light bar
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Monday, June 22, 2015, 6:18 PM

 >>>When I had a visit
 at Nuytco, Dr Phil handed me a DW light and it seems to me
 it was a complete unit with
 electronics.  .....You
 mean this one (attached picture) below Hank.  It
 doesn't seem to have any reflectors. I am
 just being precautionary bringing up the fact that these
 units have electrolytic capacitors. They may take the
 pressure.I have
 seen people pot them to give
 them strength, however they fail by overheating so this
 might exacerbate the heating problem.Below is part of an article on led
 drivers.Electrolytic Capacitors –
 LED drivers Achilles Heal
 The
 majority of high power (>15W) LED drivers employ
 electrolytic capacitors either on the input AC stage to
 enable filtering of noise or on the output channel DC stage
 of the driver.It is well known that
 electrolytic capacitors are one of the weakest elements of a
 driver circuit and frequently result in failure, especially
 at elevated temperaturesEnvironmental factors
 affecting the service life of an aluminum electrolytic
 capacitor include temperature, humidity and vibration
 (environment), as well as electrical factors, applied
 voltage, ripple current and charging/discharging conditions.
 In capacitors for mid-to-high-voltage filters, temperature
 and applied voltage are the most important controlling
 factors. The estimated service life may be calculated based
 on the core temperature of the capacitor and the applied
 voltage.Full
 article...http://www.mondoarc.com/technology/LED/228719/driving_responsibly.html

   From: hank pronk via
 Personal_Submersibles
 <personal_submersibles at psubs.org>

 To: Personal
 Submersibles General Discussion
 <personal_submersibles at psubs.org> 

 Sent: Tuesday,
 June 23, 2015 12:17 AM
  Subject: Re:
 [PSUBS-MAILIST] LED light bar

 Alec,
 Good to
 hear that they still work.  There is plenty of room for a
 proper penetrator in the end cap and as I said they are very
 robust. The cable comes out the back of the light in between
 the cooling fins, I am not sure about putting the penetrator
 in that spot though.  I am going with a p trap tube for
 simplicity.  A little fresh water is no biggy, it will just
 sink to the bottom of the housing.  When I had a visit at
 Nuytco, Dr Phil handed me a DW light and it seems to me it
 was a complete unit with electronics.  

 Rick, I will get some pictures together to show
 what I did.
 Hank
 --------------------------------------------
 On Sun, 6/21/15, Alec Smyth via
 Personal_Submersibles <personal_submersibles at psubs.org>
 wrote:

  Subject: Re:
 [PSUBS-MAILIST] LED light bar
  To:
 "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
  Received: Sunday, June 21, 2015, 10:36 PM

  I have,
  and
 so far so good with a caveat. I have two lights. They
  both still work well after a year, and have
 been to 250
  feet. That said, one of them
 replaced a little of the oil
  with fresh
 water on the last outing. I think the problem was
  where the cable enters the housing, because it
 got severely
  pulled sideways (light snagged
 in tow line). These are
  really well made,
 but even better would be a light like you

 say with a part can be pulled for drilling and tapping.
  Hank, do you think there's enough space to
 install a
  proper electrical penetrator? I
 would love to get rid of the
  weak spot
 factory cable seal.
  Thanks,

  Alec
  On
 Sun, Jun 21, 2015 at
  9:40 PM, hank pronk
 via Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:

  Alan,

  Hmmm
 maybe I should remove the electronics and put them
  inside the sub.  I thought Alec was doing the
 same thing,
  just flooding the whole
 light.

 Hank--------------------------------------------

  On Sun, 6/21/15, Alan James
 via
  Personal_Submersibles <personal_submersibles at psubs.org>
  wrote:

   Subject: Re:
 [PSUBS-MAILIST] LED light bar

   To: "Personal Submersibles General
 Discussion"
  <personal_submersibles at psubs.org>

   Received: Sunday, June 21,
 2015, 9:31 PM

   Hank,the led

   electronics I've
 looked at
  in some of my

   lampshave

   electrolytic capacitors in them, which can
 crush under

  pressure.So

  "if" it fails at depth this may be a heads up
  as

   to
 why.Alan

      From: hank pronk
  via

   Personal_Submersibles

   <personal_submersibles at psubs.org>

   To:

   personal_submersibles at psubs.org

    Sent: Monday, June 22,

   2015 12:09 PM

    Subject:

   [PSUBS-MAILIST] LED light bar

   Success,
 my new light bar is installed and full

   of oil.  It was remarkably easy, the end
 caps come off
  the

   bar and are quite heavy, so tapping a 1/8
 pipe thread
  was

   easy.  I filled the light while the end cap
 was off
  then

   reassembled it and topped it up through the
 hose
  fitting. 

   I have a p trap line (1/8 nylon)  and the
 whole
  conversion

   takes less than an hr.  The light works
 just fine,
  maybe

   not as bright as my halogen lights but much
 easier on

   power.  The
 light runs on 10 amps at 24V. 24,000 lumen

   Hank

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