Osram LD 543B-BWDW-24-0-20 orange LED
Received 12-21-07, tested 01-07-08
This is a 5mm orange LED in a water-clear transparent epoxy body. This LED came from Digi-Key in December 2007.
Measures 3,490mcd at a drive current of 19.28mA.
Spectrographic analysis of this LED.
Osram LD 543B-AWDW-24-0-20 orange-red LED
Received 12-21-07, tested 01-07-08
This is a 5mm orange-red LED in a water-clear transparent epoxy body. This LED came from Digi-Key in December 2007.
This is a very similar part number (LD 543B-BWDW-24-0-20) as another Osram LED I tested yesterday (shown directly above), but the wavelength is considerably different.
Measures 2,960mcd at a drive current of 19.28mA.
Spectrographic analysis of this LED.
3mm orange LED, origin unknown
(Rec'd 01-06-06, tested 01-30-06)
A fan of the website sent me a number of different LEDs; and 2 of these little rascals were among the goodies.
These are 3mm orange LEDs, which emit at 610 to 614mn in the orange region of the spectrum.
At a test current of 19.28mA, intensity was measured at 910mcd.
Vf was measured at 1.908 volts.
I'm not equipped to measure beam angles at all. Looks like about 27-30° to me.
Remember, wider viewing angles always, always, ALWAYS equal lower mcd values.
Hosfelt Electronics, part # 25-407, $--
This is an innocuous looking orange LED in a clear, 5mm case.
This is a Toshiba model, TLOE20T.
It has a beam angle of approximately 10°, not counting a dim ring a few degrees beyond that.
Measured at 12,350mcd (@20mA).
The color is not too far from a "neon nightlight orange" but has a noticeably more red tint than a real neon bulb.
Estimated peak wavelength is approximately 607nm.
Beam from this fairly decent orange LED.
As with all LED beam shots on this site, the LED was placed 16" to 17" from the paper target.
All photometric readings on this site (in candlepower, foot-candles, or mcd) are taken 12" from the sensor.
Hosfelt Electronics, part # 25-276, $3.49
Here's another one of those gigantic 10mm super jumbo LEDs we all know and love (ha!).
But this one might change your mind about them. Packaged in its huge, water-clear case, this LED produces a fairly tight, well-defined beam of bright orange light.
Stare into this one - even for a second - and you'll definately see spots. When shone on the ceiling from table-height, it produces a very narrow (approx. 2 or 3 degrees), squarish central beam
with four much weaker radial lines or spokes; all surrounded by an even fainter corona. If you need a bright orange LED with decent beam definition, choose this one.
No extra optics are needed here - the LED's super gigantic jumbo case supplies them for you. Although there is some waste light off to the sides from internal reflection,
the majority (95%+) leaves through the LED's face, where it's supposed to.
Although I'll have to do a bit of research, I believe this LED is easily and cheaply available through Radio Shack. More on this.
This LED's beam is so narrow and bright, it was difficult to adjust the camera to it.
The radial lines are so dim by comparison, they don't really show up here.
Radio Shack, part # unknown
This is another bright orange Radio Shack model.
Physically, it looks exactly like the Radio Shack amber LED profiled earlier. It is in a water-clear T1 3/4 case, and it's orange, bright, and has a narrow beam.
The beam is square with a dark circle in it, and is surrounded by a fainter outer ring; typical of Radio Shack's high brightness LED models.
What more can I say about it?
Beam profile, typical of Radio Shack's narrow beam 5mm (T1 3/4) case style.
Hewlett-Packard, model HLMP-DJ24 near-true "neon" orange", Newark Electronics, 10/$5.00
This is a true "ultra high-brightness" LED, which has a radiant, distinctive orange color, very similar to that of a NE-2H neon lamp; but much, much brighter.
This LED, packaged in in a clear T1 3/4 case, is almost painful to look at directly, and casts a well-defined, approximately 23-degree beam. The beam has a weak central hot spot, and
a fairly wide, even orange glow all the way to the perimeter of the beam, where it then dims into a weak corona about 5-8 degrees in from the beam's outer edge.
Spectrally, this LED shows a large peak around 600 to 605nm orange part of the spectrum, with significant output into the red & yellow, and weaker output all the way down to
around 515-525nm in the green part of the spectrum. But with most of its output in the orange, this LED appears fairly monochromatic to the average human eye.
With many of these "ultra high-brightness" models having very narrow beams, it is a refreshing change to see a model with such a distinctive color and super brightness
with a nice wide beam.
Beam of this neon-nightlight colored LED.
Toshiba, model TLOA156P, (Hosfelt Electronics 25-280) probably $0.75 apiece if still available
This is a bright orange LED with a more reddish shade of orange than the HP "neon orange" model detailed above. It seems to have a slightly narrower spectrum too, with
most of its output in the 610nm range; with significantly less deeper red output than the HP neon-orange model but only a little less green. There is significant output in the
orange and yellow regions of the spectrum, naturally.
This model also has a nice monochromatic orange appearance when viewed without a spectroscope (as most people would view LEDs).
Three of the samples showed a fairly diffuse, 40 to 50 degree beam with some radial lines or spokes visible as artifacts; a fourth had a much narrower, 20 to 25 degree beam
with an obvious central hot spot (smaller area of the beam that is significantly brighter than the rest). I am in the process of examining all of them, for it is possible one of
them is a different Toshiba model than the other three. If this is the case, it will get its own entry here.
Beam profile.
Toshiba, model TLOA180P, (Hosfelt Electronics 25-277), $0.75 apiece
Here is that "oddball" one that showed up in my samples of the LED mentioned directly above.
This one is physically a little taller than the TLOA156P, and has a much narrower, 20-25 degree beam with an obvious central hot spot.
Spectrally and to the eye, it appears identical to the above model; it produces a clear, slightly reddish tinged orange color. Its light is bright, but not exceptionally so.
Use anywhere you want a nice bright LED with a relatively narrow beam.
