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ATS* LED MODULES

American Technical Services, Inc., Pink LED Module, retail $TBA
Received & tested 01-29-08; spectroscopy with newer spectrometer performed 09-07-09
This is ATS's pink LED module. Like the NUV (near-ultraviolet) LED module I also received, it consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has three phosphor pink 5mm LEDs mounted to its upper surface, and an SMD resistor mounted to its underside.

This is the module itself.
Note the male plug on the right edge of this module.
Although these modules are intended to be "daisy chained" in sets of ten to operate from 120 volts DC (using a bridge rectifier when connected to household circuitry), these samples are wired in such a way that they can be operated directly from +12 volts.
Note the special dongle on the left connector - this is what enables me to test them at +12 volts.
When daisy chaining them to operate at 120 volts DC, place this dongle in the female receptacle in the 10th module.

The phosphor appears to be inorganic in formulation, and should not very quickly degrade like the "old style" phosphor pink LEDs that used an organic phosphor - but the only way to know with absolute certainty is to "burn in" the sample for at least a few days to see if the color changes.

(Update 01-30-08): There has been no visible phosphor degradation within the last 24 hours; this tells me that the phosphor is inorganic in formulation, and thus will not rapidly degrade.

(Update 01-31-08): There has stll been no visible phosphor degradation within the last 48 hours...surprise surprise...NOT!!!

(Update 02-01-08): There has stll been no visible phosphor degradation within the last ~60 hours.
I performed spectroscopy on this module again, and found no degradation that way either.

Measures 5,100mcd at a drive current of 28.1mA.

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this pink LED module.

Same, but after ~60 hours of continuous operation; this tells me that the phosphor is inorganic in composition.

(Update02-03-08): O NOOOOO!!! Look!!!
The blue peak is higher relative to how they were before!!!
Not good.

The only "right" thing to do now is burn it in (operate it continuously) for at least several more days, and perform spectroscopy (pronounced "

") on the module again.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., NUV LED Module, retail $TBA
Received & tested 01-29-08; spectroscopy with newer spectrometer performed 09-07-09
This is ATS's NUV (near-ultraviolet) LED module. Like the module directly above, it consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has three NUV 5mm LEDs mounted to its upper surface, and an SMD resistor mounted to its underside.

Wavelength is too short to furnish an intensity value with the instruments at my disposal.
That blue color is largely a result of my camera's misinterpretation of NUV radiation.

If (forward current) is 24.1mA at +12.16 volts.

Spectrographic analysis of this NUV LED module.

That hump near 820nm in the near-infrared region of the spectrum is the
second-order reflection from the spectrometer grating, and may be disregarded.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

American Technical Sevices, Inc., Warm white LED Module, retail $TBA
Received 01-29-08, tested 01-30-08; spectroscopy with newer spectrometer performed 09-07-09
This is ATS's warm white LED module. Like the cool white LED and red LED modules I also received, it consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has three warm white 10mm LEDs mounted to its upper surface, and an SMD resistor mounted to its underside.

This is the module itself.
Note the male plug on the right edge of this module.
Also note that the LED bodies themselves have a pink tint to them; this helps to knock the already-low blue content even lower.

Although these modules are intended to be "daisy chained" in sets of ten to operate from 120 volts DC (using a bridge rectifier when connected to household circuitry), these samples are wired in such a way that they can be operated directly from +12 volts.
You'll see the special dongle on the left connector - this is what enables me to test them at +12 volts.
When daisy chaining them to operate at 120 volts DC, place this dongle in the female receptacle in the 10th module.

Measures 65,700mcd at a drive current of 23.4mA.
Note the distinct yellowsh tint; this is not a photograph artifact, and actually exists in the light.

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this warm white LED module.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., Red LED Module, retail $TBA
Received 01-29-08, tested 01-30-08; spectroscopy with newer spectrometer performed 09-07-09
This is ATS's red LED module. Like the cool white LED and warm white LED modules I also received, it consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has three red 10mm LEDs mounted to its upper surface, and an SMD resistor mounted to its underside.

Measures 8,013mcd at a drive current of 19.4mA.

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this red LED module.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., Cool white LED Module, retail $TBA
Received 01-29-08, tested 01-31-08; spectroscopy with newer spectrometer performed 09-07-09
This is ATS's cool white LED module. Like the warm white LED and red LED modules I also received, it consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has three cool white 10mm LEDs mounted to its upper surface, and an SMD resistor mounted to its underside.

Measures 174,900mcd at a drive current of 26.3mA.
Note the distinct bluish tint; this is a photograph artifact, and is actually less-pronounced in the light.

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this cool white LED module.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., Pink/UV LED Module, retail $TBA
Received & tested 02-01-08; spectroscopy with newer spectrometer performed 09-07-09
This is one of three ATS multicolor LED modules I received around noon PST on 02-01-08. This module consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has two 5mm NUV LEDs flanking a 10mm phosphor pink LED mounted to its upper surface, and an SMD resistor mounted to its underside.

Measures 20,900mcd at a drive current of 23.4mA.
This measurement is primarily of the pink LED; the NUV LEDs have a wavelength too short to be measured with the instruments at my disposal (a Meterman LM631 light meter in this case).

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this mixed color LED module.

That hump in the near-infrared region of the spectrum is the second-order
reflection from the spectrometer grating, and may be disregarded.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

The 10mm pink LED in this module appears to have a much whiter color than any of the 5mm pink LEDs in the other modules; this makes me wonder if it has an organic phosphor formulation - I'll just have to perform a "burn-in" test over several days and see if its color changes.

Also note that the longer wavelength "hump" peaks at ~580nm, instead of at ~640nm as in the 5mm pink LEDs in the modules on this web page. This also contributes to the LED having a whiter appearance than other pink LEDs. Yes, I double-checked it on the spectrometer just to be certain it had a shorter wavelength longwave (usually red) "hump".

Here's a second spectrographic analysis of just the 10mm pink LED, taken after just several hours of operation.
As you can see, it has visibly degraded to a more-or-less white color in just a matter of hours.

This indicates to me that this LED does indeed have an organic phosphor composition; looks like ATS will have to find another supplier of 10mm pink LEDs with an inorganic phosphor formulation that will not degrade in this fashion.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., Pink/white/UV LED Module, retail $TBA
Received & tested 02-01-08; spectroscopy with newer spectrometer performed 09-07-09
This is one of three ATS multicolor LED modules I received around noon PST on 02-01-08. This module consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has a 5mm NUV LED, a 5mm white LED, and a 5mm phosphor pink LED mounted to its upper surface, and an SMD resistor mounted to its underside.

Measures 55,800mcd at a drive current of 24.4mA.
This measurement is primarily of the white & pink LEDs (mostly the white); the NUV LED has a wavelength too short to be measured with the instruments at my disposal (a Meterman LM631 light meter in this case).

Vf was +12.16 volts for all measurements.

Spectrographic analysis of this mixed color LED module.
Emission lines from the pink LED aren't shown here; its spectrum is shown directly below.

That hump in the near-infrared region of the spectrum is the second-order
reflection from the spectrometer grating, and may be disregarded.

Spectrographic analysis of the pink LED in this mixed color LED module.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

American Technical Services, Inc., Pink/white/UV LED Module (2), retail $TBA
Received 02-01-08, tested 02-02-08; spectroscopy with newer spectrometer performed 09-07-09
This is one of three ATS multicolor LED modules I received around noon PST on 02-01-08. This module consists of a PCB (printed circuit board), rectangular in configuration, sized 3" (7.6cm) long by 0.5" (1.3cm) wide. It has a 5mm NUV LED, a 10mm white LED, and a 5mm phosphor pink LED mounted to its upper surface, and an SMD resistor mounted to its underside.

Measures 55,600mcd at a drive current of 24.4mA.
This measurement is primarily of the white & pink LEDs (mostly the white); the NUV LED has a wavelength too short to be measured with the instruments at my disposal (a Meterman LM631 light meter in this case).

Vf was +12.16 volts for all measurements.

Spectrographic analyses of this mixed color LED module.

Spectrographic analysis of this LED module; different (newer) spectrometer & software used.

ProMetric analysis

Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

Samples of these modules were sent to me in the following colors: Pink, NUV (~405nm), white, warm white, and red (~635nm).

I also received multicolor LED modules in the following configurations:
5mm pink, 5mm white, 5mm NUV
5mm NUV, 10mm white, 5mm pink
5mm NUV, 10mm pink, 5mm NUV

(Update 02-04-08):
I'm now performing beam cross-sectional analyses of these modules.

There is a place on the bottom of the PC board to mount an SMD full-wave bridge rectifier; if this is done, use the two inner connections to apply 120 volts AC to the modules (PLEASE be certain you have 10 modules connected when you apply 120 volts, or the module will fail - possibly quite spectacularly so as well - if this is done.
You don't want baby tarantulas or rattlesnake eggs...I mean...you don't want an unwanted fire.

)
Remember to insert the dongle into the female receptacle on the last module, or else the set will stay dark.

No need to have a seperate board & wiring for this - this helps keep your installation neat & clean.

I was given express written consent (not just implied oral consent) to perform destructive tests on these modules; however I normally only perform these tests on turnkey products like flashlights, so these tests will not be performed in this case.

These products were made in various Hong Kong factories.
A product's country of origin really does matter to some people, which is why I published it on this web page.

(Update 09-07-09):

* The website linked here lists the primary business of ATS, but does not mention the LED products that you see on this web page - even though they are made by them.

Do you manufacture or sell an LED flashlight, task light, utility light, or module of some kind? Want to see it tested by a real person, under real working conditions? Do you then want to see how your light did? If you have a sample available for this type of real-world, real-time testing, please contact me at ledmuseum@gmail.com.

Please visit this web page for contact information.

Unsolicited flashlights, LEDs, and other products appearing in the mail are welcome, and it will automatically be assumed that you sent it in order to have it tested and evaluated for this site.
Be sure to include contact info or your company website's URL so visitors here will know where to purchase your product.

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YELLOW-GREEN 555-575mn GaAsP & related
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