LED Lighting... Yes Again

[L98-Z]

What part number was your blue and white LEDS?

[Straegen]

Right from my first invoice:

LXK2-PB14-N00 2.86 9 $25.74
LXK2-PW14-U00 3.45 9 $31.05

[bascerballer4]

It will be a good idea to use some sort of a circuit board because it helps organize your LEDs, resistors, and current regulator.

[bascerballer4]

Something like this would be ideal for a k2 luxeon light setup.

Here are some pics I found in a forum:

6 one watt Luxeon LEDs



This is his full 12 k2 Luxeon LEDs light fixture


His tank with the light fixture


Pretty nice k2 luxeon setup if you ask me Hope this helps.

Kind regards,


Chingy

[aninjaatemyshoe]

Thats really cool and quite impressive for what appears to be just 24 LEDs. I wonder how much it cost him/her in the end... I'll bet it was a fair bit less than the Solaris.

[bascerballer4]

No more than $100 for the whole set up. Each LED cost about $3-4.

[Reef55]

Chingy, can you link us to where those pictures came from please? Thanks

[friendtothefish]

Yes, Please! Id love to make one of these!

[bascerballer4]

The thread is originally in French. Here is the thread:

http://forum.aceboard.net/4978-1215-19349-1-Solaris.htm

[bascerballer4]

Found a thread on another reef forum about LEDs. He's from USA and he's selling some LEDs we were mentioning about. Take a look.

http://www.reefland.com/forum/lighti...tml#post153435

[Bergovoy]

sorry, I can not get to a valid post or thread.

[ipwizard]

Just tried to order some White LED's from FC but they are out of stock .

12 of them are ~$40, should be able to put fixture together with 48 white, and 12-24 blues for around ~$200. Not sure if this will be too much light (if there is such a thing) or not enough for an 80g 48" long tank.

[Bergovoy]

good luck, and hope to see some excellent pics...

Bill

[MercZ]

Check out this site. It goes straight to the cool white highest performing L. rebels but there is everything and all colors plus LED'S. Even have lenses. I like that the cool white go from 4100K to 10000K and the royal blues cover the full actinic spectrum.

http://www.luxeonstar.com/item.php?i...LXML-PWC1-0080

[aninjaatemyshoe]

According to that it will ship in 10 weeks, a little longer than most people are willing to wait... I'm too impatient for that!

Why are the royal blues listed in mW lumens while the others are listed in lumens? Is there a direct conversion?

I also noticed that cyan is reasonably intense, would this be a decent replacement for blue or royal blue?

[MercZ]

When you click on complete specification it tells you about all of the LED colors and there performance. I dont think I would use Cyan as it says min 490 nm and Max 520 nm. The royal blue was the closest to actinics and blue + starting with a min of 440 nm adnd maxing at 460 nm. I think the Rebel cool whites and Royal blue would make for a nice combo.

[xrunner1234]

What a waste of power in those resistors. The best way to drive with minimal power loss would be to use a current source. You can run them off the rectified AC line, use a buck converter and design for a current source. Use 1 sense resistor for feedback and set to max current.

Stack as many of them in series so that the sum of the worst case voltage drops would be less than the rectified line and let the converter do the work.

Cost and complexity may be a little higher but this is another solution.

[L98-Z]

Originally posted by xrunner1234
What a waste of power in those resistors. The best way to drive with minimal power loss would be to use a current source. You can run them off the rectified AC line, use a buck converter and design for a current source. Use 1 sense resistor for feedback and set to max current.

Stack as many of them in series so that the sum of the worst case voltage drops would be less than the rectified line and let the converter do the work.

Cost and complexity may be a little higher but this is another solution.

True, but the majority of people aren't familiar with designing current sources, or even familiar with them at all. However, practically anyone can understand the concepts behind using resistors to determine current. Even if it is rather inefficient.

[ipwizard]

Originally posted by xrunner1234
What a waste of power in those resistors. The best way to drive with minimal power loss would be to use a current source. You can run them off the rectified AC line, use a buck converter and design for a current source. Use 1 sense resistor for feedback and set to max current.

Stack as many of them in series so that the sum of the worst case voltage drops would be less than the rectified line and let the converter do the work.

Cost and complexity may be a little higher but this is another solution.

Would you be willing to draw up a schematic and list some part numbers? I understand your point about the resistors a lot of heat will be generated within the resistor which most certainly will reduce its life among other things.

I did find this cool site that creates basic LED circuits based on values you give it. Check it out http://led.linear1.org/led.wiz

I like the guy on the french site that has his configured to turn on blues, and whites on a time schedule simulating night and day, also diming the light to simulate clouds ect. Dont know if we really need to get that complicated, but it is very cool.

[ipwizard]

I found this video if anyone is curious how LEDs are made, and work.

http://www.lumileds.com/technology/ll_video.cfm

[skydvr]

Did you calculate the proper size resistor?

http://www.kpsec.freeuk.com/components/led.htm

[magnoliarichj]

how many lumens per led

[dparson22]

bump

[ipwizard]

Just got my blues to play around with. I found a simple current source circuit to try out. Jus have to figure out how to mount these suckers so they can be heatsinked dont want to burn them up.

Ill post up some pics when I start testing.

[jackryan]

wow, interesting concept... hope you guys can post more links and pics...