[PSUBS-MAILIST] LED Lights

Tue Jul 28 10:05:39 EDT 2015

If you look at the Deepwater Power and Light web site,
http://www.deepsea.com/products/lights/led-matrix-3r-sealite/ they have as
light as you describe.  Could be an option for phase 2.  Right now, we are
focusing on a self contained light.

On Mon, Jul 27, 2015 at 4:15 PM, Antoine Delafargue via
Personal_Submersibles <personal_submersibles at psubs.org> wrote:

> Hello all;
> what about removing all electronics from each lamp, keeping a simple
> cavity with just the led array; connector; and lens?
> The back face from where the led array would be glued would sit in water
> for efficient heat dissipation.
>
> Then the electronics would be enclosed in a separate 1atm casing; with
> less of heat management constraints,
> from that extra box; you can have as many outlets as lights on your boat
> (say 3 to 4 typically), and one inlet only from the hull (safer) with
> sufficient number of pins to control lighting modes; dimming and what not
> in a preprogrammed switching sequence.
>
> this option simplifies lights designs, makes electronics a bit more
> complicated but merges it in one pcb but increases number of connectors;
> but if you go for blue globes between central electronics box to the light
> pods it is not an issue.
> However; I know nothing in electronics; so I don t know what sort of cable
> length we could have between electronics and led without loosing nice
> control of led voltage?
>
> regards
> Antoine
>
> On Mon, Jul 27, 2015 at 9:53 PM, Alan James via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>> David,
>> do you have some sort of thermostat in the driver or are you that makes
>> it blink.
>> or are you simply using resistors?
>> Here is the link to the Newtsun, it doesn't say in the specs that it is
>> oil filled
>> but I remember being told that & it's design indicates that.
>> http://nuytco.com/products/newtsun-100/
>> Alan
>>
>>   ------------------------------
>>  *From:* David Colombo via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Tuesday, July 28, 2015 7:33 AM
>>
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Hi Alan, one thing that I have observed so far is that without a heat
>> sink, the led will heat up in about 15 seconds and then start to flash on
>> and off.
>>
>>
>>
>> On Mon, Jul 27, 2015, 12:29 PM Alan James via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>> Hi David,
>> you can get really simple with these LEDs & run the emitter straight from
>> the power source. The light intensity fluctuates with the heat, but with
>> the
>> light intensity we are talking about, it might not be noticable. The
>> trick would
>> be picking a voltage low enough so that it didn't get too bright & burn
>> out the
>> emitter when it warmed up.
>> Next step up in simplicity is to just stick a resistor in series, & there
>> are
>> calculators for this on line. I am wondering if a thermister instead of a
>> resister
>> would be a good idea, as this would restrict the current as the unit
>> heated up.
>> It may be a good option for running out of water if the thermister values
>> were right.
>> The beauty of this system would be that you would only have 2 components
>> that you could damage by heating. The down side is a reduction in
>> efficiency
>> over a buck driver type system.
>> Cheers Alan
>>
>>   ------------------------------
>>  *From:* Seaquestor via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>>
>> *To:* Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> *Sent:* Tuesday, July 28, 2015 3:10 AM
>>
>> *Subject:* Re: [PSUBS-MAILIST] LED Lights
>>
>> Hi Cliff, maybe Phil could chime in on his led he demonstrated at his
>> shop for use on the deep workers. It had only a flexible membrane over the
>> oil compensated led housing. I think his design is about as compact as you
>> can get, and I recall it had now fins, but run a voltage up to around 200+
>> volts. Seems to me that simpler the better, is the idea here. For me I will
>> testing my design hopefully next week. with 4 leds, wired for high and low.
>> Based upon alum cost, machining, leds and  subconscious connector I'm
>> coming in around $500 for each light. Cost may drop with multiple units.
>> But one off is always more expensive.
>>
>> Best Regards,
>> David Colombo
>>
>>
>>
>> Sent from my Verizon Wireless 4G LTE smartphone
>>
>>
>> -------- Original message --------
>> From: Cliff Redus via Personal_Submersibles <
>> personal_submersibles at psubs.org>
>> Date: 2015/07/26 1:28 PM (GMT-08:00)
>> To: Personal Submersibles General Discussion <
>> personal_submersibles at psubs.org>
>> Subject: Re: [PSUBS-MAILIST] LED Lights
>>
>>
>>
>> For anyone that has a large LED or halogens on their boat, can you share
>> your experience on narrow beam vs flood lights.   Building a LED housing to
>> be low profile to fit in a FRP recess is going to be difficult with a
>> reflector to get a narrow beam.  As an example, a typical reflector size
>> for a Vero 29 is 110mm (4.33") diameter and 67mm (2.64") deep.  This is
>> massive and you still need housing and heat sink fins.
>>
>> I am wonder if we really need a focused light or is a flood light
>> adequate?
>>
>> Cliff
>>
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