[PSUBS-MAILIST] LED Lights

Sat Jul 25 16:45:23 EDT 2015

Cliff that's exactly what I would plan to do with a pair of these lights.
Until recently I was thinking "surface mounted" flat lights, but I'm now
thinking recessed, mounted in a hole with a rubber gasket. They would go on
the bottom forward edge of the MBTs. Its low enough that even if the gasket
leaked a little, they're almost at the bottom of the tank anyway.

Best,

Alec

On Sat, Jul 25, 2015 at 10:17 AM, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan, my thinking is that with the flange, you could mount the light
> either way.  On the new boat I am designing, I am planning a FRP recess so
> that outside of the flange is flush with the outside of the FRP shell.
> Would still need to cut a hole were the body passes through the FRP shell.
> Yes this does reduce the convection heat transfer from the light but I was
> thinking of leaving say a 3/8 clearance around the recessed flange.  I
> don't see any problem with either approach to sealing on a MPB by using a
> neoprene flat gadget.
>
> Cliff
>
> On Fri, Jul 24, 2015 at 3:58 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Cliff,
>> I was thinking of fitting the light in to a bowl shaped
>> recess in the fairing / ballast tank, whereas you were proposing
>> cutting a hole out & fitting it in. In hindsight your idea is better
>> because my idea would inhibit the heat dispersion due to the fiberglass
>> surrounding the light fitting.
>> Alan
>>
>>   ------------------------------
>>  *From:* Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Saturday, July 25, 2015 8:43 AM
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Alan, I am visual kind of guy.  Can send me sketch of what you are
>> describing and we can talk.
>>
>> Cliff
>>
>> On Fri, Jul 24, 2015 at 3:23 PM, Alan James via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>
>>
>> Looks a good solid light Cliff.
>> On looking at the perpendicular cable entry, I was thinking we
>> need a back entry for the purposes of mounting in to a housing
>> in the fairing as you have requested in your list.
>> I am looking at mounting in to ballast tanks so will create the shape
>> of the light in the molding to receive it. If there was a threaded
>> extension on the back of the light it could slot through a hole & be
>> secured
>> with a nut. This would make it easier to seal off the ballast tanks in
>> my situation.
>> Alan
>>
>>   ------------------------------
>>  *From:* Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Saturday, July 25, 2015 1:55 AM
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Ken, if you go to Youtube and do a search on https://youtu.be/D7VnwODU7vk,
>> or 5000 Lumen Bridgelux Vero 18 LED light, you will see a short video of
>> the light.
>>
>> Cliff
>>
>> On Thu, Jul 23, 2015 at 3:29 PM, Ken Martindale via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>>
>>
>>
>> Cliff,
>>
>> How do I look at them??
>>
>> Ken
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Clifford Redus
>> via Personal_Submersibles
>> *Sent:* Thursday, July 23, 2015 4:18 PM
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Now that Jon has the forum site set up for the LED light project, my
>> suggestion is to move the discussion to the forum site called out in Jon's
>> email.  BTW, I have uploaded to the site the wiring diagram and housing
>> drawings for the 5000 Lumen light that was designed by the ME students I
>> was mentoring last year.
>>
>> Cliff
>>
>> On Thu, Jul 23, 2015 at 2:55 PM, Ken Martindale via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>>
>> Doing the dimming electrically is easy but the problem is the extra
>> wiring and where do you mount the Potentiometer?
>>
>> We can include the wires in the cable for use as an option this also
>> complicates the cabling. Instead of two wires we would require 4 wires.
>>
>> Personally I also like the dimming since it will extend the time you can
>> use it out of the water. Anybody also like or dislike? Cliff would like to
>> delete.
>>
>> You guys be sure to keep reading the spec. it will have almost daily
>> updates for a while.
>>
>> Ken
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Alan James via
>> Personal_Submersibles
>> *Sent:* Thursday, July 23, 2015 3:31 PM
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Cliff, Ken,
>> I like the dimming option. The 10,000 lumens may be too much light in
>> some low visibility conditions where there is a lot of back scatter.
>> The 5,000 lumen option may act like a fog light.
>> Also I am thinking of having lights mounted to the side which may not
>> need to be as intense.
>> Depth rating.... looking at the drawings of various 10,000 meter light
>> housings,
>> it seems simple to achieve a reasonable depth without much more cost.
>> Potting the board..... I would be careful about what was potted in case
>> some of the
>> components needed to get rid of a bit of heat.
>> Mechanical housing..... with you on that one Cliff. Like the idea of the
>> recessed light.
>> Alan
>>
>> ------------------------------
>> *From:* Clifford Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Friday, July 24, 2015 4:06 AM
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Ken, good first pass at the specs.  Below are comments.  BTW, I will post
>> these here as I have not been able to get the activation code back yet on
>> registering at the forum.
>>
>> Item 2.1 DC Voltage.  If it were me, I would stick with nominal battery
>> bank voltages of 24 and 36 VDC.  When I switch to MK 101 thrusters, I
>> dropped my main battery bank voltage to 36VDC my instrumentation bus is
>> 24VDC.  Would need a single fuse holder to accept fuses to handle different
>> nominal voltages.
>>
>> Item 4.0 Depth Requirement.  In the spirit of keeping cost down, I think
>> 500 meters (1640 ft) would be more than enough.  I know Scott is designing
>> a deep diving boat but is any one else shooting for more than 500m?
>>
>> 6.0 Dimming.   I would omit the ability to dim the light.  Yes I know it
>> is easy from an electrical point of view but it forces us to go with more
>> pins on the subsea connector.  I am thinking on installing multiple lighs
>> so I could just control on/off for each light.  I could go either way on
>> this but in the spirit of KISS, I vote to omit dimming.
>>
>> 8.3 Ports  I would change plastic to acrylic.  I don't think we will end
>> up here but if we do, we can use PVHO flat view port calcs to size the
>> acrylic lens.
>>
>> 9.0 Printed Wiring Boards.  I really like the way the Minn-Kota motor
>> controller PWBs are potted.  Rather than using the spray on hydrophobic
>> coatings, to me we should pot the board (accept for access to fuse).
>> Therefore suggest changing the word coated to potted.
>>
>> 11.0 Mechanical Housing.  I suggest.  The LED panel light and PCB shall
>> be contained in a single 1-atm flange mounted cylindrical housing with a
>> low profile that can be recessed in a FRP shell with attachment screws from
>> the rear of the flange.  The housing should contain a single 29 LED Array
>> rated at 10,000 lumens  with a rated power of  91-140 lumens/W (109-71W).
>> Mounting holes will be provided for an optional SS yoke style support
>> bracket.
>>
>> Material: Hard anodized 6061-T6 or 7071-T6  TBD (I have a grey beard
>> machinist friend that owns a machine shop.  He loves 7071-T6 as it is a
>> dream to machine and stronger than 6061-T6.
>>
>> On Thu, Jul 23, 2015 at 9:52 AM, Ken Martindale via Personal_Submersibles
>> <personal_submersibles at psubs.org> wrote:
>>
>>
>> Cost is critical. The electronics should be a small part of the cost. The
>> housing might be the most expensive.
>>
>> Hope you guys are reading the specification.
>>
>> Ken
>>
>> *From:* Personal_Submersibles [mailto:
>> personal_submersibles-bounces at psubs.org] *On Behalf Of *Clifford Redus
>> via Personal_Submersibles
>> *Sent:* Thursday, July 23, 2015 10:18 AM
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Jon, thanks for setting up the forum.  I am assuming we can post files as
>> well.
>>
>>  I agree low cost is important but having a functioning light is as
>> well.  OTS LED utility lights like that one you noted are not an option
>> unless they can be potted.  To me the best way to keep the cost low, is to
>> publish construction drawings of a 1-atm  DIY housing that a psubber could
>> machine or have machined by a friend, and publish a design of a PCB that
>> could be easily fabricated using  one of the PCB online sites like
>>  ExperessPCB www.expresspcb.com and DIY populate the board.  As a group,
>> we design and build a prototype that I can test in my shop. If it works as
>> designed, then we post to the psubs site a report, that includes the design
>> drawings, circuit diagram, parts list and test results.
>>
>> Getting a consciences on the design spec is the first step.
>>
>> Cliff
>>
>> On Wed, Jul 22, 2015 at 10:11 PM, Jon Wallace via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>
>> My three words of advice...cost, cost, cost.
>>
>> One measure of a success for this project will be how many people
>> actually build/use it.  If it costs more to manufacture than just
>> purchasing something like
>> http://www.surpluscenter.com/Electrical/Lights/DC-Mobile-Equipment-Lights/12-24-VDC-3120-LUMEN-16-LED-UTILITY-FLOOD-LIGHT-12-999-B.axd
>> off the shelf then it's real world application by psubbers may be limited.
>>
>> Over-spec'ing the design above requirements for typical recreational
>> operations (ie 10,000 psi capability) is likely going to drive up the
>> cost.  Also, let's remember that "cheap", "low cost", and "good price" are
>> relative terms for a diverse group like PSUBS so include realistic
>> estimates of parts and manufacturing especially if tooling is required.
>>
>> Jon
>>
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