Water proofing of LED Lights


#1

hello ..

Since one month i´m working for an austrian watermonitoring company.. to develope an waterproof fish-counting system based on a networkkamera.....

The system is based on a axis network-camera P1357 and a waterproof housing (build by hartenberger. com prox 500€ ... ) -

The camera system will be waterproof to the deht of 100 meter thats more than enogh..

Our mainproblem is to creaete a waterproof LED light Panel in the Sice of 1500mm x 1000mm to backlight the scenerie during fishconting ...

I will try to to solve the problem throug putting on LED Stripes at a acryl plate in sandwich style .. and fix the edges with windschield glue from the automotiv industrie...

Will it work or not, what dou you think.. (max depht will be in -1m ....)

greetings from austria

ps: is there an austrian open-rover in the community


#2

Servus Stills & Frames,

for a depth of one meter you will surely find different lights at Conrad (www.conrad.de). Of course the wont have that size, but it should be easy to combine some to 1,5 x 1 m.

Another idea: There is a company for aquarium and pond equipment in south germany: http://www.tunze.de/

I'm from Kochel am See - thats about 40 km from the austrian border.


#3

How long are the system going to be submerged?

What i think you can do is mount the led you want on a plate, and make a frame around the edges. around 1cm higher than the Led's should be ok.(less is probably ok aswell)

then you get hold of Araldite DBF / HY 956 epoxy. this is a epoxy used in electronics industry with a high tensile strenght(durable) and it completely clear. just a bit shade of yellow color to it.

this you pour into the frame with the connected wires sticking out of the mold.

finished ;-)

i have practical experience with this material to fill electronic modules so they can withstand high pressure when submerged in oil. it works.

contact you local glue company, they can guide you further.

if you have problems sourcing this; i use these guys in Norway: http://www.lindberg-lund.com/ http://www.lindberg-lund.com/electronics (i see now that they even have LED specific materials!)


#4

hello thomas..
thank´s for your tips..

during the developing time, the system will be submerged for one or 2 month.... .

at least wehen its ready it will come out after 3 weeks to make a servive after than it go´s to the next river powerstation.

its sounds good to epoxy the plate but it must be made from alluminium or brass to bring the heat of the leds away .. but i devenly need a non collored epoxy to realize a daylight situation..
i also ´will test the lights from Reimar Große-Bölting´s suggestion... -http://www.tunze.de/

greetings from austria andy


#5

The DBF epoxy sticks quite good to aluminium, the applications i've used it for has a aluminium potting frame.

the DBF epoxy also transfers the heat quite good.

the nice thing with leds in this application, is that the heat goes out on the backside of the led, and not forward into the epoxy.

If this light plate is supposed to be man-handled i think i would split the lights into 50x50cm sections. a big area of 150x100cm can easily bend, and then crack the epoxy. if you section it, it will be easier to handle. the last thing you want is for this to crack when moving it.


#6

there is an Austrian OpenROV builder ... however I'm still in the phase of building it


#7

As Thomas pointed out below, you can directly pot the LEDs in an optically clear epoxy to waterproof them. There is a good research paper from MBARI describing this process -here

I'll try do download the post the paper here, since its currently paywalled XD

Personally I've made ringlight LED systems that I simply coated in optical epoxy that were able to survive pressure tests of 1500 meters of depth. So it should be fine!

-Colin