[PSUBS-MAILIST] PSUBS light project status

Sat Jul 2 16:50:33 EDT 2016

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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