[PSUBS-MAILIST] LED light bar

Mon Jun 22 18:18:22 EDT 2015

>>>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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