[PSUBS-MAILIST] 12V DC Light Survey

[Steve McQueen via Personal_Submersibles]

Alan/Hank, good information. I have some time to finalize my light solution. 

Sounds like 10A per light is reasonable. I am using the same Subconn penetrator/connector as we use for the Psubs std. comms. connection. 

I will feed 2 lights thru 1 penetrator. My design has 4 lights total. 2 fwd, 1 port and 1 stb. 

Steve





On November 9, 2018, at 11:12 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Steve, Jon,

sorry didn't see the comment about oil / air.

I went with air after playing around with oil. Mainly because of mess & concerns

about the oil degrading or yellowing of the oil. The perspex lens I was using

with oil compensation, trapped the heat in compared with a glass lens. 

You put your hand in front of the glass & plastic lenses & a lot more heat 

radiates out through the glass. 

When we visited Nuytco they were using oil compensated lights with an oil

filled plastic wiring tube out the back. I am pretty sure I remember one of their

guys saying that they initiate the collapse of this tube by putting some

sort of clip on it. We discussed this on Psubs & thought that the plastic tube

could take more than 100psi before collapsing & equalising the light fitting

without this initialisation.

I spent a lot of time designing & building my lights, but I was aiming for something

as small as possible. If you don't care about size then oil compensating an off 

the shelf light as Hank suggested will save you a lot of time. I think Alec hard

anodised an off the shelf light. 

Below are the parts for the light I made, including the mold for the polyurathane

exterior of the wire entry. The lens, driver, driver housing & large teflon seal that

the lens sits on were custom made for me.

Alan





On 10/11/2018, at 1:54 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

Jon, Steve

Not sure if this is up your alley, but here is a picture of a 10,000L oil filled light that is very easy to build and inexpensive.  I have tested this light to 1,500 psi.   This is a short version of the 24,000 L light on Gamma that is just amazing.  The light consists of a off road light bar circuit board that slides tightly into an acrylic tube with rubber ends to act as bellows.

Hank


On Friday, November 9, 2018, 3:57:23 PM MST, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote: 



I would add to that survey, please describe the ease of air/oil compensating the light.



From: Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org>
To: Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> 
Sent: Friday, November 9, 2018 4:51 PM
Subject: [PSUBS-MAILIST] 12V DC Light Survey


All, for those using 12V systems I was wondering who has an LED design that works well? Was hoping to get feedback on lumens and currents.


I am allowing 10 amps per light as an assumption for choosing a penetrator rating (10k lumens = approx. 111 watts (LED), 111W/12V= 9.25A).


Seems 10k lumens has proven enough from what I have been observing.


Looking for some validation, feedback. 


Thanks, Steve


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