How do we power 4 - High Power LEDs - White Warm White, 3000K 2932lm, 800mA, 80CRI - from 11-13v Lipos?
Choose it for the size, lums, CRI, and Lum/Watt ratio. It will be easy to build a watertight housing for each like a small flash light (torch) so that the reflector cone and angle of the light can be adjusted to best suite the cameras.
http://www.mouser.com/ProductDetail/Cre ... %2FKfvcExV
--Doug
Project Page: http://www.submarineboat.com/Streamlined_Mini_ROV.htm
Help with Cree LED 12v Power Supply
Re: Help with Cree LED 12v Power Supply
Hi, TBH - not exactly sure of the question your asking ?
Do you need to know how to wire them up, or the "best" method for turning them on/off ? if you'll be using LiPo batteries, you need to pay special attention to the discharge rate and draw from the LEDs -if you drain the LiPos past their nominal lower cell Ve they REALLY don't like it.
Do you need to know how to wire them up, or the "best" method for turning them on/off ? if you'll be using LiPo batteries, you need to pay special attention to the discharge rate and draw from the LEDs -if you drain the LiPos past their nominal lower cell Ve they REALLY don't like it.
Re: Help with Cree LED 12v Power Supply
Thanks, we figured it out. The question we were trying to ask is how to we supply power to these LED's and the answer is a constant current LED driver. A friend pointed us to eBay where there are several Cree LED arrays complete with 12v DC input drivers available. We have picked the 100 watt units and now have them. I saw spots for an hour after powering it up. 10,000 lumens is awesome. We got some reflector shields too that work great for focusing it into a beam.
http://www.submarineboat.com/images/Str ... driver.JPG
Has anyone tried Cree high powered LED's in seawater without anything more than potting the connections? Any advice there?
http://www.submarineboat.com/images/Str ... driver.JPG
Has anyone tried Cree high powered LED's in seawater without anything more than potting the connections? Any advice there?
- TigerShark
- Posts: 108
- Joined: Jan 7th, 2014, 2:43 pm
- Location: Washington State
Re: Help with Cree LED 12v Power Supply
Deal Extreme (dx.com)has a great selection of Cree LED's, drivers and special lenses designed for them. I use two 5W LED's with diffusor lenses which really seem to provide a nice even light in the front of the ROV. I haven't dived with them yet so we shall see how they look underwater. The drivers are 6-18v I believe.
Re: Help with Cree LED 12v Power Supply
I know this may sound silly, even a bit bonkers. But you can have tooo Much light! the camera will 'see' in its own light visual range. In water the refraction is different to air.
For example driving a car in snow with full headlight creates a blinding 'back-scatter' of reflecting light from the snow back towards your eyes. The same thing for the rov cameras, particles will 'back-scatter' the light into the camera.
Therefore if you can control the brightness / or dim the power to the lights this will help.
OR... Direct the light in a off set pattern to illuminate the general area. Rather than a full beam.
(A quick 'Bodge' Tape over part of the light with electrical tape, as a quick fix.)
For example driving a car in snow with full headlight creates a blinding 'back-scatter' of reflecting light from the snow back towards your eyes. The same thing for the rov cameras, particles will 'back-scatter' the light into the camera.
Therefore if you can control the brightness / or dim the power to the lights this will help.
OR... Direct the light in a off set pattern to illuminate the general area. Rather than a full beam.
(A quick 'Bodge' Tape over part of the light with electrical tape, as a quick fix.)