Calling out to Weezard for LED advice

[ledtime]

HAHAHAHAHA!

Sorry for messing up your shirt! I'm an ADD victim myself. I put my car keys down somewhere three days ago and I've yet to find them!

The only worry I have is that the graph readout for those reds says the mcd reading is 3333. A little low no? I sent the guy in china an email questioning this. I would hope they would be a little brighter?

I'm like a little kid waiting for santa right now. I can hardly contain myself. This will be a loooooonnngggg wait.

This should be REALLY interesting with this dual blue spectrum I have in both lights.

Now I just need to get some good seeds. I only have some bagseed of this jamaican stuff at the moment. Not sure what it is, but it knocks me on my ass.

I'm just setting everything up and going over the grow tent. It's a 3'x3'x6'. I would really love to have two separate places...one for veg and one for flower so that I can clone and cut some time out. However, I don't think I have the space. Maybe I can divide the grow in half by builiding a shelf to separate it? but with 5g DWC I need some headroom.....

[Weezard]

Here is the test results of the 660nm red 1W LED's that are going into my flowering light:

http://img38.imageshack.us/img38/4903/red1wtest.jpg

WTF?!
The wavelength looks peachy.
But in place of a lumen rating I see 3333.0 mcd.
That's 3 1/3 candela per emitter.
Now, my math stinks, but that looks like about 267 lumens for 80 leds.
I don't know a lot about 1 Watt leds. Is that typical output?

Off to do some research.
Weeze

Woops!
You are way ahead of me.
Never mind.
W.

[ledtime]

I used an online calculator for LED's to calculate lumens per LED. The calc says 10.471 lumens per LED. There are a 100 red LED's in the array putting it at 1,047.1 lumens. That seems pretty bad????

[Weezard]

I used an online calculator for LED's to calculate lumens per LED. The calc says 10.471 lumens per LED. There are a 100 red LED's in the array putting it at 1,047.1 lumens. That seems pretty bad????

Well,


PLEASE NOTE that the lumen per watt figures in this document are lumens of light produced per watt of electricity delivered to the LED. Some LED manufacturers state much higher figures indicating the lumens per watt of radiated light. The latter, high figure is typically in the ballpark of 60-100 for red, 130-180 for orange-red, 220-265 for red-orange, 440-500 for yellow, 400-plus to near 660 for green (656 for Avago HLMP-C115), and around 50-90 for blue. The main purpose of this "high" figure is for conversion between radiometric and photometric units for the emitted light. If the conversion efficiency and the "high" lumen/watt figures are both known, multiply them to get the lumens out per watt in.
Beam brightness and width figures below are mostly ones claimed by manufacturers/distributors and I have NOT confirmed most of these.
Most Efficient Deep Red / Pure Red LEDs - 14-15 lumens/watt

InGaAlP LEDs with dominant wavelength at least 631 nm are sometimes called "royal red". These deep red InGaAlP LEDs often achieve 12-15 lumens/watt.

UPDATE 5/11/2009: LEDEngin makes some deep red high power LEDs, available at Mouser Electronics. These LEDs have rated peak wavelength of 655-670 nm, typically 660 nm. These appear to me to use GaAlAsP chemistry and to be unusually efficient for GaAlAsP.
The LEDEngin LZ4-00R210, LZ4-20R210 and LZ4-40R210, at 700 mA, are claimed to have typical voltage drop of 10.5 volts and typical radiant flux of 1.8 watts. This is typical efficiency of 24.5 percent.
One update of mine is that spectral analysis indicates dominant wavelength of 643-644 nm and luminous efficacy of the emitted light to be about 60 lumens/watt. If radiometric efficiency is indeed 24.5%, then overall luminous efficacy is 14-15 lumens per watt.
Other LEDEngin high power deep red LEDs achieve efficiency similar to or slightly lower than that of LZ4-00R210, LZ4-20R210 and LZ4-40R210. Red LEDs with GaAlAsP and Avago's similar AlGaAs in my experience, when doing well, tend to achieve 7-8 lumens per watt. But unlike the more efficient orangish red ones below, they are truly fairly pure red in color, with dominant wavelength (color specification roughly meaning hue) of 637-648 nm, usually 640-645 nm, and peak wavelength of 645-665 nm, usually 660 nm.

So, ya see, it's simple, but it's not that simple.

Your thoughts?

Weeze

[ledtime]

I thought those LEDEngin's were a lot more efficient. With those numbers they are on par with 1W's. So these reds that I'm getting are not all that bad as they should be putting out the same lumens/watt as the 10-15W's.

Am I correct?

[Weezard]

I thought those LEDEngin's were a lot more efficient. With those numbers they are on par with 1W's. So these reds that I'm getting are not all that bad as they should be putting out the same lumens/watt as the 10-15W's.

Am I correct?

The 15 Watt dies do about 15 L. per W.
You calculate 10.471 L. per led.
(I think you meant to say per Watt, so it will be a bit less per led.)

So, no.
But you can not expect them to compete head to head.

My concern is the mcd rating.
I built an array of 10 mm. leds rated at 70,000 mcd ea.
Granted those were "hong kong" ratings and were the result of a very narrow, (15-20%), beam width.

We need to look at the output of a few other provider's 1 watt deep reds.
If these leds are in the same ballpark, pull the trigger.:rastasmoke:

What are the spec on the blue leds?

W.

[ledtime]

It looks like the mcd rating on the blues are the same. But they are EXACTLY the same. Maybe it is a default number and they weren't testing mcd???

I guess I just have to wait until they email me back. They usually do right about now so it shouldn't be too long a wait until we get some answers!

Oh, these things are 120deg. so they say.....

[ledtime]

What did your chinese UFO put out? 1W LED's in it right?

[Weezard]

What did your chinese UFO put out? 1W LED's in it right?

By the lux-meter?
7,500 max lux at 12" dead center.
Calibrated eyeball?
Very bright.
Results?
Vegges very well, so far.

Specs?
No gottum.

Gey a Reply yet?
It should be very early there.
So, we wait.

W.

[ledtime]

So,

I finally got word just now. The red 660nm LED's put out 21.7 lumens per LED. The blue 430nm put out 13.7 lumens and the 453nm puts out 28.7 lumens.

Does that sound alright for these? The graphs he sent me before were for LED's that run at much lower wattage.