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Phosphor Purple LED
5mm phosphor purple LED, Lumex part number SSL-LX5093VC
(Rec'd 07-31-08, tested 08-03-08)
This is one of three LEDs sold as "InspirationLEDs" by Lumex. Although this might look like an ordinary 5mm clear through-hole LED, it differs from most others because it is phosphor-based, and emits a purple light. The phosphor formulation is very likely inorganic and therefore, stable; as this LED is meant to be used on a continuous basis.
It is designed to emit a purple light, and it has a beam pattern that's smoother in general profile than any non-phosphor LED - but I rather expected this from a phosphor lamp.
This LED has a noticeable color gradient from the center of its beam to its outer perimeter; noticably blue in the center and a pinkish purple toward its edges.
Beam photograph on the test target at 12".
Intensity measures 3,740t an If of 19.28mA. Vf is 3.151 volts.
Spectrographic analysis of this LED, using newer spectrometer software.
Spectrographic analysis of this LED, driven at 19.28mA.
Spectrographic analysis of this LED, driven at ~1.9mA.
ETG, model ETG-5AX420-15, available from ETG
This is ETG's companion to their phosphor pink model 5AX440-15, as shown on my Pink LEDs page.
This LED emits a distinctive purple lavender color, much less "coral" tinted than their pink lamp. It comes in a standard, water-clear 5mm (T1 3/4) epoxy package, and features a mainly orange-emitting, green-blocking phosphor over a narrowband 450-460 blue LED die.
The LED's beam on the test target (right) next to the coral pink ETG lamp.
Brighter than the coral pink LED; this one measures 3600mcd.
The main concern here with all the new colored phosphor LEDs is will the phosphor decompose rapidly like Roithner Lasertechnik's pink LED did? I don't think it will. I performed a brief test where the LED was continuously powered for a number of consecutive days, and there were no visible changes.
Update 07-12-02: This is now being marketed as a purple phosphor LED with its own part number; the original coral-colored lamp is now on the Pink LEDs page.
The phosphor in both lamps is remarkably similar; it emits strongly in the orange and blocks strongly in the green. The difference between the coral pink LED and the purple lavender LED seems to be the intensity of the orange and blue bands. The coral has a stronger orange and weaker blue; while the purple has a slightly weaker orange and a slightly stronger blue. Both seem to eliminate the green band to pretty much the same degree.
This LED is based on a typical GaN blue emitting formulation; it needs approximately 3.6 volts at 20 milliamps. Beam divergence appears to be approximately 15°, give or take. The manufacturer states its useful lifetime at 10,000 hours; it will probably last a lot longer than that, though the color will probably slowly become more (noticeably) bluish as you pass the 10,000 hour mark. Only time will tell for sure though.
Spectrographic analysis of this LED.
Spectrographic analysis of this same LED; using newer software.