[PSUBS-MAILIST] PSUBS light project status

Sun Jul 3 09:08:24 EDT 2016

Hi Cliff,

You got the attention of Captain Quaker there, as I too am running a 36V
bus and the simplest most rugged driver is no driver. Since my boat hasn't
been in the water yet I don't know what voltage drop I'll see at hard
throttle, but in my experience the lead foot only comes down on the surface
where I don't particularly need dive lights. When dived, the thrusters are
just ticking over. Do you know what would happen when the voltage falls
below 35.1? If the lights just go a bit dimmer, that might be fine. If its
a step function on the other hand and they just go out altogether, then
obviously not so good.

Best,

Alec

On Sat, Jul 2, 2016 at 4:50 PM, Cliff Redus via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> Alan, my boat has the propulsion buss at 36VDC nominal and everything else
> on the 24VDC buss.   My exterior lights run of the 36VDC buss.  The voltage
> range for 36V buss is 30-40vdc, fully discharged to fully charged.  If I
> Iook at the specs on the 10K Lumen Bridgelux, the driving voltage
> requirement is 35.1V to 40.4 V with 38V as nominal.  So I could in theory
> run this LED array without any driver at all but every time I hit the
> throttle, the lights would dim.  I need a constant current LED driver that
> holds the current to 2.1 amps.  Like you I have been looking for OTS led
> drivers but have not been able to find one that meets the specs outlined in
> Ken M. spec and are small enough to fit in as tight enclosure.
>
>
> Cliff
>
> On Sat, Jul 2, 2016 at 3:05 PM, Alan via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> Cliff,
>> what voltage are you running on your sub?
>> You can generally run these leds at a lower voltage & it is
>> beneficial to them. If you have a bench top power supply that goes to
>> 36V, you can
>> slowly power up the led without a driver & check if it is bright enough
>> at 36V. Don't
>> do this for more than a second or so or you may destroy the led. I am
>> having a 48V
>> system, but the choices in electronics that are compatible, dramatically
>> drops over a 36V system.
>> I have looked at just about every off the shelf led dc driver on the
>> planet.
>> cheers Alan
>>
>>
>>
>> Sent from my iPad
>>
>> On 3/07/2016, at 7:03 am, Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> This LED driver will not work for the 10K lumen Bridgelux LED as it needs
>> 38V forward voltage , 2.1 amps and 80W.  This driver can only get up to 36V.
>>
>> Cliff
>>
>> On Fri, Jul 1, 2016 at 11:39 PM, Alan James via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>> Alec,
>>> I have been working on a light housing. Have attached a dwg but it is
>>> not finalized.
>>> I would have had it completed but have been waiting a Month on a
>>> replacement motor
>>> for my lathe :(
>>> I am using a square 50W LED, but you can get 60 & 80W LEDs the same size.
>>> I am NOT putting the driver in the light housing, it ends up sitting at
>>> the back of the LED
>>> where there is a massive amount of heat generated from these high power
>>> LEDs.
>>> Keeping the driver in the hull makes it easy to change out if it fails.
>>> I am going with an acrylic lens & oil compensated. I would have liked a
>>> borosilicate pressure
>>> resistant lens but it was going to cost $100-+. Also if there is a leak
>>> with a pressure resistant
>>> housing, electrolysis can pressurize it with hydrogen gas.
>>> I am not using a reflector as they don't seem to do anything with these
>>> big LEDs. They are really
>>> rows of little 1W LEDs,10X6 for a 60W. So you get light being emitted
>>> from either side of the inch
>>> wide emitter, that is hard to control, especially when you are wanting
>>> an  80 degree wide angled
>>> flood light.
>>> My design also revolves around local stock aluminum tube sizes.
>>> The LEDs are around 30 to 36V. I am using these as drivers. $4.64 US,
>>> not bad.
>>> Alan
>>> Constant Voltage Constant Current DC-DC Power Module for Arduino
>>> <http://www.dx.com/p/5a-constant-current-led-driver-module-battery-charger-red-433947#.V3dE1bh96Uk>
>>>
>>>
>>> $ 4.64
>>> Constant Voltage Constant Current DC-DC Power Module for Arduino
>>> I like this from DX. Find the cool gadgets at a incredibly low price
>>> with worldwide free shipping here.
>>>
>>> <http://www.dx.com/p/5a-constant-current-led-driver-module-battery-charger-red-433947#.V3dE1bh96Uk>
>>>
>>> ------------------------------
>>> *From:* Alec Smyth via Personal_Submersibles <
>>> personal_submersibles at psubs.org>
>>> *To:* Personal Submersibles General Discussion <
>>> personal_submersibles at psubs.org>
>>> *Sent:* Saturday, July 2, 2016 1:41 PM
>>> *Subject:* [PSUBS-MAILIST] PSUBS light project status
>>>
>>> Hi gents,
>>>
>>> I have an almost-ready sub but no lights, so was wondering whether to
>>> make them per the PSUBS-designed model in the community projects section of
>>> the website. I'm in awe of those drawings! However, they show a printed
>>> wiring board that is a placeholder for a part still to be designed. I was
>>> wondering if that might have happened, or if there might be an ETA?
>>>
>>> Thanks,
>>>
>>> Alec
>>>
>>> _______________________________________________
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>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>>>
>>>
>>>
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