[PSUBS-MAILIST] dive report

[Clifford Redus via Personal_Submersibles]

To me potting or not comes down to the cost of the housing.  If you can
find an adequate low cost housing and that the housing fits your
application, maybe like the one Alan posted, then its worth experimenting
with potting. If we can not find an adequate OTS housing, and we have to
machine a housing, then it makes more sense to build as 1-atm housing and
utilize the mounting base so that the LED array can be change out.

Potting the back of the LED is not going to work.  The manufacture requires
that the back of the LED be in contact with an aluminum heat base to
conduct heat also you need to use a thermal grease behind the array.  I
work if you potted the face of the LED that it would prevent adequate heat
transfer.

Cliff

On Thu, Jul 23, 2015 at 8:35 AM, Sean T. Stevenson via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> I wonder if you could pot such a light in two pours? Fill the back end
> with e.g. MG Chemicals 832TC, and once that cures, cover the emitters with
> 8322?
>
> Sean
>
>
> On July 23, 2015 6:57:54 AM MDT, via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>>
>> Before I oil compensated my 10,000 lumen LED head light, I messed around
>> with epoxy potting. I had two problems. One is the epoxy yellowed over
>> extended time of use as most resins and plastics do. The other is with a
>> LED this powerful, it does give off heat and the epoxy acted as a insulator
>> instead of a conductor. This resulted in the LED starting to burn inside
>> the potting. Two corrections for this would be to experiment with different
>> epoxies and / or not use such a powerful LED array as what I am using. I
>> like my lights bright :)
>>
>> Thanks,
>> Scott Waters
>>
>>
>> -------- Original Message --------
>> Subject: [PSUBS-MAILIST] dive report
>> From: hank pronk via Personal_Submersibles
>> <personal_submersibles at psubs.org>
>> Date: Thu, July 23, 2015 5:09 am
>> To: personal_submersibles at psubs.org
>>
>> Hi all,
>> I went out to Kootenay Lake and did a dive with Tim and Shelly Novak
>> yesterday. I met an engineer from Ontario, I showed him my killer light and
>> he said "why don't you pot the whole thing instead of oil filling" Hmmm I
>> had no response, he also said they have potted LED's for use in chemical
>> environments. I use a crystal clear casting resin for making electrical
>> penetrators. Might be worth a try.
>> Hank
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