ROITHNER LASERTECHNIK
LEDs & LED FLASHLIGHTS

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

Roithner Lasertechnik, warm white 5mm LED, B5-43SUN-JB
Received on 02-26-05, tested on 02-27-05
 This is a warm white LED in a water-clear 5mm epoxy package.

The color tint of this white LED is warmer than standard white LEDs, with a color temperature estimated at 4,000°K. The light output has a noticeably pinkish cast to it; this is perfectly normal with warm white LEDs.


Measures 6,900mcd with a test current of 25.5mA.



Roithner Lasertechnik, violet LED, LED435-12-30
Received on 01-21-05, tested on 01-25-05
 This is a violet LED, in a water-clear 5mm epoxy case. It has a dominant wavelength (where you would point to on a color chart) of 420nm.

This LED emits a very unusual, vibrant violet to blue-violet color. To the eye, the color appears to be a royal purple; with increasing distance, the color appears to become a deeper violet.


Color is not bright magenta as shown in this photograph; it appears to be a deep royal purple to the eye.

Intensity cannot be measured with the instruments at my disposal.
Since somebody is going to ask anyway, it measured 930mcd on a Meterman LM-631 light meter. This is probably a false low value, as the wavelength is too short to measure correctly with this meter. Don't tell me I didn't warn ya.



Roithner Lasertechnik, diffused blue LED, L5R460-B1
Received on 01-21-05, tested on 01-23-05
 This is a blue LED, in a diffused, blue-tinted 5mm epoxy case. I cannot provide beam photographs or intensity measurements of diffuse case LEDs, so I cannot provide that information here.

The baggie this LED came in is labelled "blue dashboard", so I take it from that these LEDs are designed to go in automobile dashboards as indicators or as decorative lighting.

It has a dominant wavelength (where you would point to on a color chart) of approximately 460nm.


Photograph of the LED itself, showing it comes in a tinted, diffused package.


Photograph showing the LED illuminated in my LED test set.


Spectrographic plot
Spectrographic analysis of this LED.


Spectrographic plot
Same as above; newer spectrometer software & settings used.
Spectrometer's response shortened to 370nm to show some NUV emission from this lamp.
Comes in a dark blue-tinted epoxy body.






Roithner Lasertechnik, pink LED, 5RH HCA- PH
Received on 01-21-05, tested on 01-23-05
 This is a pink LED, in a water-clear 5mm epoxy case. I do not have the equipment to measure the peak wavelengths or color temperature of this lamp, so I cannot provide values here.

The phosphor in this LED is reportedly stable; in that the emitted color should not rapidly degrade as can happen with some pink LEDs. This indicates the phosphor has an inorganic composition, not organic. My LED burn-in test set has not yet been found following a move I made on 10-11-04, so I'll just have to take the word of my contact at Roithner Lasertechnik. And if you cannot trust a man at his word, then things must be really screwed up.


Measures 2,990mcd at a drive current of 25.5ma.
This corresponds with the 2,000-3,000mcd at 20mA as printed on the data sheet.



Roithner Lasertechnik, turquoise blue LED, RLS-5B475-S
Received on 01-21-05, tested on 01-23-05, repeat spectroscopy performed 09-03-09
 This is a turquoise-blue LED, in a water-clear 5mm epoxy case. It has a dominant wavelength (where you would point to on a color chart) of 477nm to 480nm. This is a slightly longer wavelength (slightly greener) blue than you normally find in blue LEDs, and its color is a bit unusual, so please don't be caught off-guard when you fire one of these LEDs up.

This LED emits a dark sky blue or azure blue color.


Measures 5,570mcd at a drive current of 25.5ma.
This corresponds with the 4,000mcd at 20mA as printed on the data sheet.


Spectrographic plot
Spectrographic analysis of this LED.


Spectrographic plot
Same as above; newer spectrometer software & settings used.



Roithner Lasertechnik, blue-violet LED, LED435-12-30
Received on 01-21-05, tested on 01-22-05
 This is a blue-violet LED, in a water-clear 5mm epoxy case. It has a dominant wavelength (where you would point to on a color chart) of 435nm.

This LED emits a very unusual, vibrant blue-violet color. To the eye, the color appears to be a very deep cobalt blue; with increasing distance, the color appears to take on a more violet tinge.

The person who sent these marked on the baggie "MY FAVORITE LED", and I agree - the color is very pleasant to see.


LED's light does not have that violet color in the center as this photograph depicts.
Measures 2,280mcd at a drive current of 25.5ma.
This corresponds with the 1,800mcd-2,500mcd at 20mA as printed on the data sheet.



Roithner Lasertechnik, cyan LED, 10C4DHCB-H
Received on 01-05-04, tested on 10-16-04, spectroscopy performed 09-01-09
 This is a blue-green (aqua) LED, in a water-clear 10mm flangeless epoxy case. It has a dominant wavelength (where you would point to on a color chart) of 500nm. This LED has four dice (light-emitting chips) inside, connected to one another in parallel, so the forward voltage is 3.251 volts at 83mA (0.083 amps).

This LED emits a distinct blue-green light.


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


Measures 3,950mcd at a drive current of 83ma.
Remember, wider viewing angles ALWAYS equal fewer mcd.

Beam angle appears to be APPROXIMATELY 100 degrees. I am not equipped to measure beam angles, so this is just an eyeballed value.


Spectrographic plot
Spectrographic analysis of this LED.



Roithner Lasertechnik, near-UV LED, 5P4 FCA
Received on 01-05-04, tested on 07-03-04
 This is a 395nm near-UV LED, in a water-clear 5mm epoxy case. This particular LED has a Vf (forward voltage) of 3.35 volts, and its forward current is shown as 20mA.

This LED emits a dim violet glow, but WILL cause fluorecence in objects that fluoresce in green, blue, violet, and longwave UVA radiation.

The die (light-emitting chip) inside this LED has two bond wires attached at opposite corners. It is not a Nichia or Cree product; I don't know who manufactures the dice used in these LEDs.


Wavelength is too short for me to measure intensity, with the instruments at my disposal. Beam angle appears to be 15 to 20 degrees. I am not equipped to measure beam angles, so this is just an eyeballed value.
Note: The purplish magenta color in this photograph is a camera artifact; the color appears to be a deep, dim violet to the eye.



Roithner Lasertechnik, part # B5-433-B505
Received sometime in 2002 and tested on 04-27-04
 I received two of these LEDs sometime in 2002, and they just turned up around 6 this evening while I was looking for a spec sheet for another LED.

These are turquoise (bluish-green) LEDs in water-clear 5mm epoxy cases. Dominant wavelength (where you might point to on a color chart) appears to be around 507nm. My spectrometer is still broken, so this is an "eyeballed" figure. This is a bit on the greenish side of bluish-green, but it's nothing whatsoever to be concerned about. LED manufacturers are making bluish-green LEDs this way on purpose, rather than with a bluer tint (the so-called "Tokyo blue" with a 490-500nm wavelength that used to be more common among blue-green LEDs around the turn of the century).


Intensity measures 6,390mcd with a test current of 25mA.
Viewing angle appears to be approximately 15°.
Remember, I don't have an instrument for measuring this, so this is an "eyeballed" figure too.



Roithner Lasertechnik, part # RLT365-525
Received and tested on 04-23-04
 A fan of the website sent me two of these LEDs, identified as Roithner Lasertechnik's RLT365-525, a 365nm UV LED in a water-clear 5mm epoxy package. This is the shortest wavelength LED that I've seen or tested.

This LED outputs 850µW (0.85mW) of ultraviolet radiation at 365nm when driven just under 20mA.
The LED appears to have a dim purplish-white glow to it; most of its output is at 365nm, which is generally considered to be invisible to the human eye. At low currents (just under 2mA), the LED appears to have a weak greenish-white color to it, but still emits UV as it causes UV-reactive substances to fluoresce.


The camera and LED were placed no more than three inches from the target for this photograph, as I could not obtain a picture from the ~12" normally used for this type of photograph. The LED's wavelength was also too short to measure its light output or run it through the ProMetric system.


Picture of a UV-reactive glass marble fluorescing under this LED's light.



Roithner Lasertechnik, blue LED, 10B43 HCA
Received on 01-05-04, tested on 03-26-04
 This is a large 10mm blue LED, that features four dice (light-emitting chips) in parallel inside the LED body and is rated for a continuous operating current of 80mA. The wavelength appears to be around 470nm, right where it ought to be for this lamp. This is an "eyeballed" figure, as my spectrometer is still broken, and I don't yet have additional equipment with which to take spectra of LEDs or any other light sources.

This isn't a large-junction device like a Luxeon, but it's still an impressive LED.


Test current 69mA.
Measures 5,290mcd, but remember, wider viewing angles always equal fewer mcds. And my equipment may not be as sensitive at these wavelengths than it is at longer ones.
This LED has a 60° viewing angle, and comes in a 10mm clear epoxy case.



Roithner Lasertechnik, zinc selenide (ZnSe) white LEDs, RLx Series
Received and tested on 03-13-04, spectroscopy performed 09-03-09
 This is the world's first known zinc selenide (ZnSe) non-phosphor white LED that has been offered for sale anywhere. Although there was some work on ZnSe blue and non-phosphor white LEDs being done in the early- and mid-1990s, it wouldn't be until early 2004 that they would be made in quantities large enough to offer for sale. Roithner Lasertechnik has these LEDs in at least five types (5mm and 3mm epoxy through-hole, and three types of SMD) at the present time. The part numbers and such of the ZnSe white LEDs Roithner has are as follows:

RLZB-52, 3.5 - 4.5 cd @ 20 mA, Vf = 2.65 V, 20°, 5 mm clear epoxy
RLZB-32, 3.5 - 4.5 cd @ 20 mA, Vf = 2.65 V, 20°, 3 mm clear epoxy
RLZS-1608, 200 - 300 mcd @ 20 mA, Vf = 2.65 V, 150°, 1608 SMD package
RLZS-2012, 200 - 300 mcd @ 20 mA, Vf = 2.65 V, 150°, 1608 SMD package
RLZS-3528, 400 - 500 mcd @ 20 mA, Vf = 2.65 V, 120°, 3528 SMD package


Here's a beam photograph of one of the 5mm ZnSe white LEDs.
Measures 5,800mcd on a Meterman LM631 light meter, with an If of 30mA.
Spectrally, this LED has a strong, narrow blue spike (est. peak around 480-485nm) and a strong, very broad emission in the yellow, orange, and red; with a weaker, but still significant emission in the green. The spectrum appears to be deficient in blue-green, and all wavelengths below around 470nm (deep blue and violet). My spectrometer is busted, otherwise I'd show you with a spectral analysis.

This LED produces a beam with a slightly but noticeably bluish-greenish-white central area, with a "very strong dog urine yellow" (dark amber to orangish or brownish) ring outside that. This is expected behaviour with a non-phosphor, 3mm or 5mm epoxy lens LED, and does not in any way indicate a problem with this type of lamp.

From the datasheet, comes this snippet:

o The half-life of the optical output at 25°C is over 3,000hrs at the above If condition (20mA).
o Recommended If at 75°C is 5mA. The half-life under such condition is over 1,000hrs.
o The half-life of the lamp is inversely proportional to the square of the operating current.

They still have a small problem with short device halflives, but it's still pretty decent for a lamp.

(Update 04-01-06
Spectrographic plot
Spectrographic analysis of this LED.


Spectrographic plot
Same as above; newer spectrometer software & settings used (3mm version).


Spectrographic plot
Same as above; newer spectrometer software & settings used (5mm version). USB2000 spectrometer graciously donated by P.L.




WHITE 5500-6500K InGaN+phosphor 
ULTRAVIOLET 370-390nm GaN 
BLUE 430nm GaN+SiC
BLUE 450 and 473nm InGaN
BLUE Silicon Carbide
TURQUOISE 495-505nm InGaN
GREEN 525nm InGaN 
YELLOW-GREEN 555-575mn GaAsP & related
YELLOW 585-595nm
AMBER 595-605nm
ORANGE 605-620nm
ORANGISH-RED 620-635nm
RED 640-700nm
INFRARED 700-1300nm
True RGB Full Color LED
Spider (Pirrahna) LEDs
SMD LEDs
True violet (400-418nm) LEDs
Agilent Barracuda & Prometheus LEDs
Oddball & Miscellaneous LEDs
Programmable RGB LED modules / fixtures
Where to buy these LEDs 
Links to other LED-related websites
The World's First Virtual LED Museum
Legal horse puckey, etc.
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