[PSUBS-MAILIST] 12V DC Light Survey

[Alan via Personal_Submersibles]

Steve,
I am using a 48V system but have a constant current buck / boost 
LED driver that operates on an input voltage between 12 & 54V.
I had these built for me with a dimmer.
Most of the high powered LEDs run on around 36V. There are a lot
of constant current boost modules on ebay etc that will boost your
12V to 36V. Read the fine print as some times they specify the
addition of a heat sink for high powered use. When I was looking it
was difficult to find a unit with dimming & I think this is important
in low viz where you will get a blinding back scatter on high power.
My unit is 70W & has about 7-8000 lumens output.
I am using two of these flood lights set up like headlights.
If you went with my 70 W system that would mean the LED driver would 
be drawing about 6 Amps from the batteries off a 12V system but outputting 
about 2 Amps at 36V to the LED. 
So if you keep the driver in the hull 2 Amps through the through hull & if the 
driver is in the back of the light 6 Amps for a 70W LED.
I recommend keeping the driver in the hull, as the LEDs put out a lot of
heat that can cook the electronics & I know with DC motor drivers they
recommend as short a run of wire as possible from battery to driver.
Cheers Alan

> On 10/11/2018, at 9:58 AM, Steve McQueen via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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