Some light

[manhattan]

Dreadful winter in Europe is preventing me to do a proper ROV test in lake, so I am a bit bored atm. and playing with light. While I am waiting for CREE diodes to arrive (I will try to drive them on 2A for approx 2000 lumens ) I collected some lights I found in house and did a basic test. Don’t know if it’s at all useful but anyway.

My favorite pick (the one I potted and mounted on ROV) is the 2.8w LED. I really liked that light (until tonight) it was very bright in the house and I potted it without optics. Now I see that I need a focus lens on it to be useful . I guess it can always serve as a diffuser in front with proper spot LEDs on the sides of ROV.

All these lights are fairly easy to waterproof one way or another.

[AHarris]

Thanks for sharing this, this chart shall be extremelly helpful in my ROV.

I have nevered heard of CREE diodes before and when doing a quick google search I came up with little?
What exactly does the CREE stand for?

Thanks

[manhattan]

Hi,
Think CREE is company abbreviation for “Creative Resource & Energy Efficiency” not sure its them though.
I decided not to use any of the lights on the chart but to build my own, based on Cree. Currently the top LED
is the CREE XM-L diode (first from left) which can be driven at 3A producing ridicules amount of light

The big one is a 50W LED and the light is just insane (around 4000 lumens on less then 2A) but it is too difficult
to keep cool (+ it needs 30+ v). That one will have to wait for another project. The winner (for me) was the
3 up Indus Star, (2nd form right) driven at 1A it produces a beautiful clean light +1000 lumens.
You can get it from:
http://www.ledsupply.com/indusstar-3up.php.

I know XM-L is more powerful but the star gave the best lumens/watt and is fairly easy to waterproof.

Best

[AHarris]

Thanks, I shall check them out when I come to adding the lights on my project.