Want to design a 10,000 lumen underwater light ( Runs off 12v boat battery )

[BobBarker]

If I was doing this for myself...

I would use the Bridgelux BXRA-40E7500-J-00 (4000K, 80CRI ($63.83 from my favorite supplier)
8250 REAL (actual in sustained use) lumen at 3.2A 30.5 that equates to 84.5 lumen/watt During sustained use.

or the Bridgelux BXRA-50C9000-J-00 (5000K, 70CRI ($76.65)
9416 REAL (actual in sustained use) lumen at 3.2A 30.5 that equates to 96.5 lumen/watt During sustained use.

use one TASKLED Hyperbuck @ $40

Don't bother with any kind of reflector (if you are wanting to use it at 15' or less and you want it to cover a large area... you don't really need it.

This gives the simplicity of a single large LED/ single driver setup, that can be driven by something as simple as 3 small 12v SLABs or as exotic as a 11-12cell Li-ion setup... For a setup with 12 (panasonic ncr-18650a) li-ion cells, it would weigh 19oz and run for a little over an hour or so (I figure about an hour and 5 min) or 3 7.2AH 12 SLABs (at a weight of 14lbs and figure maybe 3-4lbs for the heatsink (can be fairly small) and everything else... As long as the enclosure is greater than a 7.82" cube ( 476.76 cubic inches) it will be buoyant (so you could have more space for battery as ballast)...

So
$77 for LED
$40 for driver
$81 for SLABs
$5-10 for heatsink big enough for water cooling the LED
$30? for enclosure...
$20 for switches and wiring

So about $258 for the whole thing (give or take $20-30


But that's just me...

Oh, and run time on the SLAB setup is about 100min...

 

[choppedliver]

how about PU encapsulated LED strip? 12V DC suitable for boat battery. It's waterproof IP68, could used in sea water.
the top quality of SMD 5050 chip could achieve 18-21 lm/pc, using 60leds/m strip, one roll(5 metres) 300 pcs LEDs,total about 6,000 lm, 72 watts.

What is "pu encapsulated"?

 

[lucca brassi]

Poly Urethane http://www.wisegeek.com/what-is-polyurethane.htm

 

[demonic69]

3 of these: http://www.led-tech.de/en/High-Powe...REE-XM-L-U2-on-round-PCB-LT-1791_120_117.html
and one of these http://www.lck-led.com/constant-current-circuit-driver-modes-5512v9asst90-p-863.html?cPath=37_135
If you could get the voltage to 15 you'd be in!
If not you could risk direct driving them with a 9w 1Ohm resistor in series

 

[jspeybro]

perhaps this one:
http://www.cutter.com.au/products.php?cat=Leds+on+40mm+Round+MCPCB
together with 2 taslked H6CC drivers or so you should be fine I think.

 

[thenativediver]

Do your lights have to be LED?

I bought a couple of underwater lights from "fishnlights". I got two for my dock and one for my boat for looking for lobster at night.

It is a 200w CFL with housing (I think), and it lights up a nice area. Fifteen feet is no problem... in clear water anyway. Runs off battery (think it uses an inverter, but I don't remember)

You can lower the light on a pole or with a weight.


How will you keep your lights waterproof?

 

[thenativediver]

My docklites, by same company, are metal halides and are 36000 lumens each (they claim) with 400w halides.

These are super bright!

What are you useing the lights for?