[PSUBS-MAILIST] LED lights

[Alan via Personal_Submersibles]

Rick,
I have built my led 7000lm 36V lights & are going to use 2 out front.
I have used them on a boat & in the bush & don't consider them an 
overkill. I think with the clear water in Hawaii you would want more
lumens as there will be a further distance that you can see night diving.
I have dimmers on mine for low visibility diving, as the back scatter from
the muck in the water will be blinding.
Led's need a driver to give them constant current & of lesser importance
constant voltage. They are reasonably voltage tolerant as long as the current 
is controlled. I mistakenly had a 36V led running off 80V. 
You can build your own but for me it was a lot of mucking about designing,
sourcing lenses from China etc. I had my led driver designed & made
specifically for me by a Chinese firm. I am not happy with aspects of the
design as there is a certain part that needs heat sinking & default mode
is on if the wiring comes apart. So will be re-ordering an updated driver
some time in the future.
You can find suitable buck boost drivers on ebay as Alec did, but not with
dimming.
They don't get too hot if you run them in water & heat sink them to a base.
The easiest idea, as Hank says is to find a suitable off the shelf light that
you can oil compensate. The drivers however have electrolytic capacitors
that are vulnerable to pressure, so if the driver is in the light unit it could
fail under pressure if compensated.
I have subjected an led on it's own to 2000psi & it survived.
Most of the high power leds are around 36V.
Let me know if I can help.
Emile sells an led light!
Cheers Alan



Sent from my iPad

> On 2/02/2018, at 10:33 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Rick,
> You can keep it real simple and just buy water proof lights (LED) and oil fill them.  Just inspect the light to make sure you can drill and put a filler plug in.  I have great luck with a 24,000 lumen light bar.   I am actually buying a clear acrylic cylinder to put my light into.  Alec has had luck with this also, maybe he can suggest the particular light to use.
> Hank
> 
> On Thursday, February 1, 2018, 2:06:41 PM MST, Rick Patton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> I have been experimenting with my LED exterior lights which is a field I know nothing about which makes it even that much more frustrating and wanted to get feedback from those who have had success so far using them.
> 
> I was planning on using incandescent lights but everyone I talk to say that LED is the only way to go. I guess my reasoning for staying with incandescent was that it was a no brainier for me but I liked what I heard about LED. I initially figured that if 10 lumans is good 10,000 is much better but I am finding out that once you get up to that high a luman, a lot of things kick in that you have to deal with!
> 
> I also am thinking that I can probably get away with a heck of a lot less lumans due to the visibility that we have here in Hawaii so maybe all I need are 5,000 luman lights which put out a lot less heat and don't have to deal with some of the issues that a 10,000 luman light would.
> 
> All input appreciated!
> In the dark in Hawaii! not to mention fake missile alerts!!
> 
> Rick
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