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ROITHNER LASERTECHNIK
LEDs & LED FLASHLIGHTS

I received a number of LEDs and two flashlights from Roithner Lasertechnik
on 01-05-04; they will not all appear on this page simultaneously, but
will appear here over time as time permits and testing is conducted.

NOTE: This is page 1 of the Roithner Lasertechnik section. Go here for page 2.


Roithner Lasertechnik, LED-Lenser V16 Chip-Fire
Received on 01-05-04, tested on 02-15-04, updated with a spectra on 08-22-06.
This is one of the flashlights I received with some Roithner Lasertechnik LEDs in early January 2004.



I believe this is the LED-Lenser V16 Chip-Fire; please feel free to correct me if I'm wrong. This is a very thin white LED flashlight that uses two lithium BR435 cells for power. This flashlight is approximately 3 3/4" long and 1/4" wide at its widest point. It has a lanyard hole in the tailcap, so you can affix a lanyard or split ring to this opening if desired.

To use this flashlight, just twist the tailcap clockwise (as if tightening it) to turn it on, and twist the tailcap counterclockwise (as if loosening it) to turn it off.

To change the batteries, unscrew & remove the tailcap, and throw it away...O WAIT, YOU'LL NEED THAT!!! So just set it aside instead. :-) Tip the two dead BR435 cells out of the barrel, and dispose of or recycle them as you see fit. Insert two new BR435 cells into the barrel, pin (+) first, then screw the tailcap back on. Unscrew it slightly (around 1/4 of a turn) when the V16 Chip-Fire springs to life.

Here's a picture of one of the batteries, so you'll know what to look for:

These cells are used in lighted fishing lures, so your local outdoors or fishing goods store ought to have them.

The V16 Chip-Fire isn't watertight, but it is water resistant, and it shouldn't give you any guff if you use it in the rain or snow. There's an O-ring in the tailcap, so I don't think it will leak through that end. Not very readily anyway.

It has "roithner-laser.com" printed (silkscreened) on its side, so you'll know where it came from. :-)


Spectrographic plot
Spectrographic analysis of the LED in this flashlight.
USB2000 spectrometer graciously donated by P.L.



Measures 6,900mcd on a Meterman LM631 light meter.
Current usage was measured at 15mA; this is a low value for a flashlight and the batteries should last a long time before needing to be changed.

My contact at Roithner Lasertechnik also sent a one-cell version of this flashlight; it is identical to the Micro Opto E-Light as shown on this web page if you're interested.
The only noticeable difference between this flashlight and the Micro Opto E-Light is that this flashlight has "roithner-laser.com" silkscreened on its side.



Roithner Lasertechnik, high-powered blue LED, 10B4DHCB-H
Received on 01-05-04, tested on 03-07-04, spectroscopy performed 09-01-09
This is a high powered LED in a 10mm flangeless epoxy package. There are 4 dice (chips) in a parallel array inside this lamp, and it has a wide viewing angle of 80.

The lead spacing is nonstandard - it's wider than regular 5mm or 10mm LEDs, so you'll want to know that ahead of time.


Here's a picture of what the LED itself looks like.

The dominant wavelength (where you would point to on a color chart) appears to be 466nm to 468nm. My spectrometer's busted, so I have to "eyeball" this figure, but I think it's reasonably accurate. Looks to be a bit longer than 465nm, but a bit shorter than 470nm.


Measures 1,740mcd. Remember, wider viewing angles always equal fewer mcds.
Test current was 76mA; lamp is rated for 80mA forward current.


Spectrographic plot
Spectrographic analysis of this LED.



Roithner Lasertechnik, part # EP2012-150R1
Received on 01-05-04, tested on 01-25-04
This is a companion to the LED shown below. Instead of cyan, it outputs a red light at about 640nm (eyeball figure, as my spectrometer is broken). It is said to consume 0.6 watts of power, putting it between a standard 5mm LED and a 1.2 watt Luxeon Star LED. A generous metal heatsink slug on the LED's bottom can be affixed to a larger heatsink if you wish using thermally conductive adhesive like Arctic Alumina epoxy or similar compound. This slug is electrically connected to the LED's cathode (-) connection though, so you'll want to be aware of that if you decide to affix this LED to a heatsink, and then affix the heatsink to a metal chassis.

The lens size appears to be 10mm or 11mm; this LED can be purchased with either lens size, and I don't know *exactly* which one of these two it is.
The part number on the bag it comes in is EP2012-150R1.
I believe the "R" near the end stands for "red".
Like the LED below, this is a Paralight part.


Measures 64,500mcd with an advertised 10 viewing angle.
The picture shows a yellow center, which does not really exist in this LED's beam.
The beam consists of a central hotspot, surrounded by a bright ring.
Test current was 150mA, using the same power supply and other parameters the below LED used.
Both this LED and the one below were fed from a Mid-Eastern current-clamping variable voltage power supply.



Roithner Lasertechnik, part # EP2012-150C1
Received on 01-05-04, tested on 01-21-04
This large LED is a cross between a 5mm LED and a Luxeon Star type LED. So if you need something in between the two, this LED might just be what the doctor ordered. The docs for it claim it to be a 0.6 watt LED, or roughly half the power of a typical 1.2 watt Luxeon Star LED. There is a generous metal heatsinking slug on the bottom of the LED, so it can be affixed to a larger heatsink with a heat-conductive epoxy compound like Arctic Alumina.

The lens size appears to be 10mm or 11mm; this LED can be purchased with either lens size, and I don't know *exactly* which one of these two it is.
The part number on the bag it comes in is EP2012-150C1.
I believe the "C" near the end stands for "cyan".
The viewing angle on this LED is advertised as 10


Picture of this LED, with a standard red 5mm LED shown for size comparison.

The dominant wavelength (where you might point to on a color chart) appears to be in the 505nm to 508nm range. Although it is just a touch more greenish than other cyan (blue-green) LEDs, this is perfectly normal for cyan LEDs, and is nothing whatsoever to be concerned about. Virtually all blue-green LEDs used to be a distinct shade of greenish-blue, known as "Tokyo Blue" (490-500nm); but the largest consumer of these LEDs, traffic signal designers, found that wavelengths above 500nm (an obviously more greenish blue-green) were more desirable, so blue-green LEDs made these days are purposefully made above 500nm, rather than below it.


Measures 49,000mcd with an advertised 10 viewing angle.
The beam consists of a central hotspot, surrounded by a bright ring.
Test current was 150mA, measured on the DMM's 2A scale to help minimise shunt resistance error.

This is a Paralight part; however the URL I was provided does not work, so I won't pass it along here. There are some other sellers of this LED though, so I'm certain as to its origin.

For the next 10 or 11 or so LEDs (from the newest high-powered ones I received, not the older or 5mm or 3mm LEDs) I'll be putting on this page, I'll probably need to use my Mid-Eastern current-clamping variable voltage power supply, and my Energy One variable voltage PSU for the last couple, as they need more than the 200mA my Mid-Eastern PSU can crank out.



Roithner Lasertechnik, part # 385D15
Received on 01-05-04, tested on 01-06-04, spectroscopy performed 09-03-09
I received a bunch of LEDs and a couple of flashlights from Roithner Lasertechnik yesterday (01-05-04), and this LED was among them.

It is a 385nm UV LED in a clear epoxy 5mm case. The die (light-emitting chip) inside is roughly rectangular, with the two bond wires attached at each end, rather than at the corners as is common with other double-bond (InGaN and GaN on artificial sapphire) LEDs.


Beam photograph at ~12"
The purplish magenta color is not how the LED beam really appears.
Test current was approximately 26mA for this photograph.

Wavelength is too short for me to get an intensity or power output reading, or run the LED through the ProMetric. Just by "eyeballing" it though (not recommended with LEDs of this wavelength range!!!), the LED appears to generate 2-4mW of output power.

The LED's UVA light will cause fluorescence in "day-glow" objects, and in glow-in-the-dark (GITD) objects. Use this LED anywhere you need some longwave (UVA) radiation. You should be able to use it for checking antique objects for repairs, looking for cat pee in the rug, checking US paper currency for their fluorescent anti-counterfiet strips (the strips glow when exposed to UVA, and as of January 2004, should be found in all demoninations except $1 bills), and other uses you might need for a UVA light.


Spectrographic plot
Spectrographic analysis of this LED.
USB2000 spectrometer graciously donated by P.L.




Roithner Lasertechnik, part # 5P4FCA
Received on 01-05-04, tested on 01-06-04, spectroscopy performed 09-03-09
This is a 395nm UV LED in a clear epoxy 5mm case. The die (light-emitting chip) inside is square, with the two bond wires attached at opposite corners. This LED shares most of its characteristics with the one directly above, except that its peak wavelength is 10nm longer and it has a slightly brighter appearance as a result.


Beam photograph at ~12"
Again, the magenta color is not how the LED beam really looks.
Test current was approximately 26mA for this photograph.

For both this LED and the one above, I used the Hosfelt LED tester as a PSU. I used the 30mA jack, knowing it outputs 26mA into a typical GaN LED. Yes, I've measured it, so I know the reading is accurate to +-1mA.


Spectrographic plot
Spectrographic analysis of this LED.
USB2000 spectrometer graciously donated by P.L.




Roithner Lasertechnik, # RLT350-30
With a peak wavelength of 350nm, this is the shortest wavelength UV LED I've heard of in current production. I have not yet seen or tested this LED, so I have nothing to report other than they exist and that Roithner Lasertechnik is where you can buy them.



Roithner Lasertechnik, # 380D30, $6
This LED is a 380nm GaN type in a water-clear 5mm epoxy package. When you first see one, you probably won't be very impressed. But that changes when you take it into a dark room and wait a few minutes for your eyes to adjust. You will then notice it causes fluorescence in a variety of materials, including white cotton, colored package labels, and stray pee around the toilet bowl or cat litter box.


To the unaided eye, this LED appears to have a dim, whitish purple glow, not unlike that produced by the Nichia UV lamp. Most of the radiation is produced in the upper UVA band centered at approximately 380nm, and is not very visible to the human eye; though if it were isolated, it would appear to have a dull, dim purple color to it.


Total power output appears to be not much over 1mW, or just slightly higher than that generated by a Nichia 375nm UV LED. It can illuminate the security strip inside paper money even after the money has been run through a washingmachine and an ordinary "money checker" using a 405nm LED would no longer be able to illuminate it.

I am not familiar with the surface geometry of the die, so I am as of yet uncertain who manufactures this LED or the die used in it. It is not Nichia and it is not Cree. That much I'm sure of. But at $6, you could build a large multi-LED "UV checker" out of these for the cost of a single Nichia.



Roithner Lasertechnik, # HUUV-5102L
I figured it was only a matter of time before Roithner got into the deep violet and near-UV LED game. And they went in headfirst, with an amazing selection of UV and near-UV LEDs now on their sales list. This is their 393-395nm UV model in a water-clear, 5mm epoxy case.

UV LED beam image
The LED color is not the magenta you see in this picture.

The chip geometry is not consistent with any of the violet LED makers who's chips I've actually seen, leaving Toyoda Gosei as the prime suspect. Power output appears to be "moderate", somewhere in the 2-4 milliwatt range. This is consistent with the last known specs on the TG "Super Purple" dice I came across about a year ago. Wavelength of the two tested samples appears to be 394 and 395nm respectively. (When comparing LEDs of this wavelength side by side, you *can* detect a 1nm difference if you know what you're looking for!)


Spectrum of this LED.

The 700nm "hump" is a detector sensitivity issue, and a program has been written to correct it. This spectrum will be replaced with a good one as soon as I can get to it.



Roithner Lasertechnik, part # HSBL-3101L, 3mm round
This is a 3mm (T1) sized blue LED in a water-clear case. The published wavelength is 460nm, which is 10nm shorter (more towards violet) than the typical "garden variety" 470nm blue LEDs that are the most widely available. This gives the LED a deeper, more pure and less whitish blue color than is usual for blue LEDs.



Roithner Lasertechnik, model ELD-920-515-1, price TBA
Here is another near-IR LED with a really unusual wavelength: 920 nanometers!
Roithner Lasertechnik specialises in LEDs with all kinds of funny wavelengths you can't find anyplace else, and this LED is one of them.

closeup of 920nm LED die
This is a photomicrograph I took of the LED's die while it was turned on. This is right at the outer edge of my new Nikon camera's radiation sensitivity, and the camera renders the IR radiation at this wavelength as a nasty shade of pukey sage green. You would *not* see anything with the eye, other than a very dull, deep cherry red glow if you're one of those who can just barely see into the near-IR. (You can tell if you're "one" if you can see a dull cherry red glow from a Radio Shack "high output" IR LED at 880nm).

The general specs of this LED go as follows:
    MAXIMUM RATINGS:
      Forward current: 100mA
      Peak forward current: 200mA
      Surge forward current (<10uS): 2 amps
      Reverse voltage: 5 volts
      Operating temp: -55C to +100C

    OPTICAL & ELECTRICAL (at 100mA):
      Forward voltage: 1.5 volts typical
      Radiant power: 32 milliwatts
      Peak wavelength: 920nm
      Spectral line halfwidth: 75-80nm
      "Viewing" angle: 20
      Switching time: 300 nanoseconds




Roithner Lasertechnik, model ELD-1300-515-1, price TBA
If you're into that really deep IR stuff, then you'll love this LED.
Emitting in the mid-IR at 1.3 microns, even my normally IR-sensitive Polaroid digital camera has problems picking this ordinary looking 5mm LED up. 1.3 microns (1,300nm) is normally thought of as a laser wavelength in the telecom and optical fiber industry. This is the only LED I'm aware of that emits in this range.


A look inside this elusive and one-of-a-kind mid-infrared LED.

The die is larger than usual, and it uses a perimeter contact bond instead of the traditional center ball or star bond. The rest of the LED looks quite ordinary, from the clear epoxy package to the leadframe & die cup.

These are the basic specs from the enclosed data sheet:
    Vf = 1 volt DC
    If = 50mA
    Radiant power = 2.3mW at 50mA (4.0mW at 100mA)
    Peak wavelength = 1.280 microns
    Spectral line halfwidth = 400nm
    "Viewing" angle = 14
This LED can take 100mA at absolute maximum, but then cooling will become an issue and device lifetime may be shortened. LED also has an unusually low tolerance for reverse voltage, with 1 volt being the absolute maximum allowable.
Chemistry is Indium Gallium Arsenide / Indium Phosphide QW
The light meter I normally use is totally insensitve to this wavelength. In fact, the reading actually went down when this LED was brought near its sensor. However it did weakly illuminate a photochemical type IR detection card.

Andreas at Roithner Lasertechnik graciously sent this sample along with samples of LEDs in two other bizarre IR wavelengths; these will be added to the page as time permits.


Roithner Lasertechnik, model ELD-740-524, price TBA
Cherry red Most scientists consider wavelengths much above 700nm to be in the infrared range; to be more precise, "near-IR". This is one such LED. Most people should still be able to see the LED glowing a very obvious, but fairly dim, deep red color, with its 740nm wavelength.

The LED puts out about 28mW, yet because it is all the way at the end of the visible spectrum, it appears much dimmer than even those cheap red LEDs you find in the VCR or the coffeemaker.

The viewing angle is narrow, I'd guess about 10 to 15.

Starting around 720nm, many digital cameras begin to interpret deep red and NIR light as some other color, starting with a red-orange color, progressing through yellowish orange, yellow, and purplish white. As the wavelength increases (goes even deeper towards IR) the camera's pictures show this color shift, eventually ending up with a faint violet color that is occasionally seen at wavelengths near 1064nm if the optical power is high enough (such as with YAG lasers)

You will see this type of phenomenon happening with the next few LEDs, which are 780nm, 810nm and 905nm respectively.



Roithner Lasertechnik, model ELD-780-524, price TBA
Cherry red Here is an LED that approaches the limits of most people's vision. Emitting 28 milliwatts at 780nm, this appears to the eye to emit a very dull cherry red glow. Most people should still be able to see the LED glowing dimly, but some people may not.

This LED is also on the detection threshold of those photochemical IR sensor cards, and you really have to saturate the card with white or blue light first, or else the emission may be too weak to be visible within just few moments.

The viewing angle is narrower than the above LED, probably about 6 to 8.

Incidentally, this LED is the same wavelength as the laser diodes used in compact disc players and older CD-ROM drives - the kind that can only read CD-ROM and audio discs, not newer ones like recordable CD or those which can play DVDs.

It is extremely rare to find an LED with this 780nm emission wavelength (especially with this high of a power output!); the 740nm wavelength in the previous sample is also rare to find in an LED.



Roithner Lasertechnik, model ELD-810-524, price TBA
Cherry red Now we're getting to true IR, which very few people can see. Emitting 28 milliwatts at 810nm, this appears to the eye to emit an almost imperceptible dull cherry red glow. Many people will no longer be able to see the output at this wavelength, but some can.

The output from this LED is easily detectable on IR detector cards and with most non-film cameras. As you can see, the camera "sees" this LED as a kind of purplish white color.

The viewing angle (emission angle) is similar to the previous LED, probably about 6 to 8.





Roithner Lasertechnik, model ELD-905-524, price TBA
Invisible Finally, this 905nm IR LED is truly invisible to the eye; and can only be detected by such items as electronic photodetectors, digital cameras & camcorders, and photochemical IR detection cards, such as Radio Shack's 276-0099.
When pushed to its limits, this LED produces some output that is visible to the eye. Remember, LEDs aren't truly monochromatic, but instead emit over a small range. If the lower end of that range is within the limits of the human eye, sometimes a weak, dull red glow can be detected.

IR sensor cards illuminate brightly when exposed to this LED's light.

The emission angle (you can't see it, so viewing angle no longer makes sense) :) of this odd LED is an unusually wide 90 to 100.

Spectrographic plot
Spectrographic analysis of this LED.
Ocean Optics USB2000 Spectrometer on loan from TWO-CUBED.



Roithner Lasertechnik, model SHPL-810-260, price TBA
big giant LED This is the evil twin to the SHPL-660 on the Red LED page. Mounted in a very beefy metal stud package, this LED means business.

With an optical output of 250 milliwatts at 810nm, this infrared powerhouse will fry your eyeballs if you stare into it.

This LED has an array of six series-connected AlGaAs chips inside.


Since this LED is so powerful it overloads my new photometer, I measured it using an equally new photometric grade photovoltaic cell provided by Don Klipstein. Using this type of photometer, the LED generated a current of almost 150mA in the cell, which works out to a staggering 240.7 milliwatts!
To put this in perspective, my "new" Techtronix J-16 Digital Photometer overloads with more than 2 milliwatts of light at any wavelength, even when the instrument is set at its highest range.

If this were a laser diode, it would have enough energy to burn paper & wood or use as a major league cigarette lighter if it were focused correctly. But since the active area is so large, you can barely perceive the thermal (heat) output with the top of a finger. And even then, it may just be an illusion.

Even so, DO NOT, and I mean DO NOT look directly into this LED from any closer than about three feet away.



The picture on the left was taken from 26" away, the one on the right from about 6" away from the target.


Spectrographic plot
Spectrographic analysis of this LED.


Spectrographic plot
Same as above; newer spectrometer software & settings used.
USB2000 spectrometer graciously donated by P.L.


(Update 12-05-07): From an email sent by www.led-eshop.de, comes this:
"This LED was made in St. Petersburg, Russia by our colleagues. Roithner Lasertechnik only distributes those LEDs, buying them from another intermediate seller- EPIGAP Optoelektronik GmbH from Berlin. The measurements and the data sheet for SHPL-810-260 (ELJ-810-xxx) was made earlier by me. Newer datasheets from EPIGAP Optoelektronik GmbH have sometimes mistakes because of lack of true specialists in the field at the company."




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