During the next few months, I will be building a (grossly overpowered) sensor monitoring overhead aquarium controller with lighting based on Arduino using:
1. 240W of cree XML2 cool white LED's running on 8 seperate pwm dimmable drivers in order to run cool lighting effects across the tank, like a passing cloud or moon, or a variable intensity nighttime fish cool white rave party.
2. a servo to control CO2 according to the level in the tank
3. an auto-fertilization system,
4. a sensor array with temperature, dissolved O2 and and pH sensors, pre-built
4.5 a self-built co2 sensor using a colorimeter which reads the color of drop checker indicator solution
5. a raspberry pi ethernet front end with a host program on the local network to send task scheduling information to the system and to display graphs from the sensors for close micromanagey monitoring.
At the time of posting, Phase 1, lighting and device enclosure has been underway for a month. After the China-wide bender that was their new year, they finally started shipping electronics parts again on Monday. once I got the parts ordered I decided I would post this thread so nobody else would start ordering the wicked sick 3a drivers I found for 7 bucks a pop.
I have never built an LED fixture. The research I did was aimed at cost reduction with as much power as possible. Essentially,
I am going to mount these (though I found them for cheaper): http://www.ledsupply.com/leds/cree-x...high-power-led
on a couple of something like these: http://www.satisled.com/power-led-al...60cm_p891.html
and run a group of four leds with some of these drivers, which are super nice for what I'm doing: http://www.prodctodc.com/dc-4530v-to...l#.Uv8MR_ldUxi
The entire thing will be mounted in a 52x4x12" rifle case with the foam inserts taken out, it was the cheapest plastic enclosure for this application I could find. http://www.cheaperthandirt.com/product/8-PLANO-153101
I will post an update when the parts arrive and I have started playing with these fancy LED's.