Lumia 5.2 DIY build

[jener8tionx]

I posted this to my local club, but I thought I'd share with the rest of the RC group. I have been working on this light for quite a while now, but I think I finally have the hardware the way I want it. I'm still working on the software, but I will post it when I get it a bit farther along.

The light is controlled by PWM from my arduino. The Tank shot at the end is with the light at 40% and the is not as blue in person. I have it set to look a lot like the Phoenix 14k 250 MH that was on there before.

Parts:

2x Lumia 5.2
3x LDD-750
2x LDD-1000
5up board
voltage regulator (from ebay)
48v 5.2A power supply
Transistor to control the fans via PWM (from ebay)

 

[djmx2002]

very nice and clean setup

 

[reefermad619]

What's the length on the heatsink and dims of tank. Looks clean!

 

[ngrubich]

Looks great! I'm looking forward to how it turns out after you finish with the programming.

 

[jener8tionx]

What's the length on the heatsink and dims of tank. Looks clean!

40 breeder tank with a 24" heatsink.

 

[sparky45]

Very nice. How do you like the lumia's so far. I have close to the same set up. I love mine.

 

[jener8tionx]

Very nice. How do you like the lumia's so far. I have close to the same set up. I love mine.

I think they are great. I was thinking about going with a retail light like the Radion or Razor, but I am very happy with the result. I wish I had done a 6up board so I could add more whites of various wavelengths.

 

[redgator]

Great set up. Thanks for sharing.

 

[jener8tionx]

Update:

I have been running these for a few months now and I couldn't be happier. Growth has been great and the cooler temperatures are awesome. Currently I am running a sine wave dimming code over 9 hours with a peak at 80%.

Here is the relevant Arduino code: (Note channels 4 and 5 are running at 16bit)

Formula:
   (z/100)*w*sin(pi*x/y)
    w = total number of PWM steps
    x = number of minutes elapsed following the time the lights turned on today
    y = total number of minutes that the light will be on today
    z = light intensity max from 1-100

Code:
   intensity = 80; //set base intentity as an integer percentage

   total_time = (night_time / 100 - day_time / 100) * 60.0 - day_time % 100 + night_time % 100;  //total number of minutes that the light will be on today

    minutes_into_cycle = (hours - day_time / 100.0) * 60.0 + minutes - day_time % 100;  //total number of minutes that the light has been on today
    
    const float pi = 3.142;
    pwmbrightnessch1 =  (intensity * .01)   * 255.0   * sin(pi * minutes_into_cycle/total_time);
    pwmbrightnessch2 =  (intensity * .01)   * 255.0   * sin(pi * minutes_into_cycle/total_time);
    pwmbrightnessch3 =  (intensity * .01)   * 255.0   * sin(pi * minutes_into_cycle/total_time);
    pwmbrightnessch4 =  (intensity * .01)   * 65535.0 * sin(pi * minutes_into_cycle/total_time);
    pwmbrightnessch5 =  (intensity * .01)   * 65535.0 * sin(pi * minutes_into_cycle/total_time);

Current FTS: (I tried to get the colors true to real life taken at about 80%.)

 

[reefermad619]

Still looking good. Can we get a pic of how things plug into the side of the fixture?

 

[jener8tionx]

In the picture it looks like quite the hack-job. It is a bit of a hack-job, but it looks much better without the flash.

 

[reefermad619]

Looks ok to me. Thanks. I'm getting ideas on how I want to wire things up for my upcoming build.

 

[summoner12]

Pretty nice build! Do you have info on your Arduino setup?

How is your fan speed controlled?

 

[jener8tionx]

The arduino supplies the PWM output for the LDD drivers. I control the fan with a TIP120. See this link:

http://www.instructables.com/id/Use-Arduino-with-TIP120-transistor-to-control-moto/

 

[jener8tionx]

Update

Update

Just wanted to share an update. It's been almost a year and everything is working great. The only change from the original build was to power the light with a CLG-150-36A cranked up to 42V. Also, I used to run the whites higher than the blues, but now I run all of the channels at the same intensity. Here's a pic so you can see the growth. I will admit that my brother-in-law who is running my old 250W MH has a bit better colors on some corals, but the trade off is heat. With my infrared thermometer the LED puck itself only gets to about 100 deg F at 80% intensity.

 

[banthonyb71]

what is the lowest voltage power supply you can get away with to run two of these? I'm in the process of my first LED build and been trying to get the PS right but its been some debating back and fourth on my thread. The loop is I plan to add a third Lumia later down the rd. or maybe even a fourth if I go bigger. right now Im looking at a 48v 350 watt MW PS.

by the way, what is the benefit of the voltage regulator and is it necessary? t

 

[jener8tionx]

You can go down to about 36-37V before the LEDs start to flicker. I would recommend staying above 40V if possible.

 

[banthonyb71]

what about the regulator? groupbuy never mentioned it to me

 

[jener8tionx]

what about the regulator? groupbuy never mentioned it to me

Regulator? You mean the DC to DC step down? That supplies 12V to the fans.

 

[banthonyb71]

Regulator? You mean the DC to DC step down? That supplies 12V to the fans.

per your words "Voltage Regulator" is what I was referring to. So it just lowers the voltage for the fans. ? got ya. ordering my first diy. making sure I covered my ground