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HEBEI I.T. SHANGHAI CO. LTD. LEDS (8)

I received yet another shipment of LEDs from Hebei I.T. Shanghai Co. Ltd. on 11-08-04.
The first page is right here, the second page is right here, the third page is right here, the fourth page is right here, the fifth page is right here, the sixth page is right here, the seventh page is right here, and the ninth page is right here if you're interested.

High-flux ("spider") yellow LED, $TBA, www.hebeiltd.com.cn..., 912m19c
(No minimum order required)
(Received 07-25-05, tested 08-27-05)

This is a high-flux ("spider") yellow LED in a water-clear epoxy case.

The light it outputs is a typical slightly orangish-yellow for a yellow LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 588nm.

The beam that comes out of this LED is smooth and very, very wide, with a beam width of approximately 150.


Unable to measure intensity or provide a beam photograph due to the VERY wide beam.
LED was tested in an American Opto Plus LED tester.



5mm round water-clear red LED, $0.07, www.hebeiltd.com.cn..., 540pr2c
(No minimum order required)
(Received 07-25-05, tested 08-23-05)

This is a 5mm round red LED in a water-clear epoxy case.

The light it outputs is a typical orangish-red for an orange-red LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 624nm.

The beam that comes out of this LED is smooth and wide, with a beam width of approximately 32 to 40.


Intensity is 2,750mcd at a forward current (If) of 19.28mA.
Remember, wider viewing angles always equal lower mcd readings.
Forward voltage (Vf) is 2.172 volts across this LED at 19.28mA.
LED was tested in an American Opto Plus LED tester.



5mm round water-clear yellow LED, $0.07, www.hebeiltd.com.cn..., L513VY3C-AH
(No minimum order required)
(Received 11-08-04 tested 04-25-05)

This is a 5mm round yellow LED in a water-clear epoxy case.

The light it outputs is a typical yellow for a yellow LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 588nm.

The beam that comes out of this LED is narrow, and consists of a square central hotspot, surrounded by a distinctly orangish outer ring.

The beam width of the central hotspot is approximately 8.


Intensity is 10,330mcd at a forward current (If) of 19.28mA.
LED light is less orangish than it appears in this photograph.
Forward voltage (Vf) is 1.949 volts across this LED at 19.28mA.
LED was tested on an American Opto Plus LED tester.



High-flux water-clear red LED, $0.11, www.hebeiltd.com.cn..., L9452HURC-AHV
(No minimum order required)
(Received 11-08-04 tested 04-24-05)

This is a high-flux ("spider") red LED in a water-clear epoxy case.

The light it outputs is a typical red for a red LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 640nm.

The beam that comes out of this LED is very wide, and consists mainly of a smooth flood with a rather sharp perimeter.

The total beam width is approximately 100.


Intensity is 2,350mcd at a forward current (If) of 150mA.
Intensity value is lower than expected mainly due to the wide viewing angle.
LED light is less orangish and more reddish than it appears in this photograph.
Forward voltage (Vf) is 2.005 volts across this LED at 150mA.
LED was tested on an American Opto Plus LED tester.



5mm water-clear red LED, $0.05, www.hebeiltd.com.cn..., 5B41HURC-D
(No minimum order required)
(Received 11-08-04 tested 04-18-05)

This is a 5mm round red LED in a water-clear epoxy case.

The light it outputs is a typical red for a red LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 640nm.

The beam that comes out of this LED consists of a square central hotspot, and a dimmer ring surrounding the hotspot.

The width of the central beam is approximately 15, with a total beam width of approximately 45.


Intensity is 940mcd at a forward current (If) of 19.28mA.
Intensity value is lower than expected mainly due to the wide viewing angle.
Forward voltage (Vf) is 2.106 volts across this LED at 19.28mA.
LED was tested on an American Opto Plus LED tester.



5mm water-clear yellow-green LED, $0.06, www.hebeiltd.com.cn..., 533VG3C
(No minimum order required)
(Received 11-08-04 tested 04-18-05)

This is a 5mm round yellow-green LED in a water-clear epoxy case.

The light it outputs is a typical yellow-green for a yellow-green LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 568nm. It also has a dark greenish-amber ring surrounding the central hotspot.

The beam that comes out of this LED consists of a square central hotspot, and a dark greenish-amber ring surrounding the hotspot.

The width of the central beam is approximately 5.


LED light is significantly more greenish and dimmer than is depicted in this photograph.
Intensity is 5,770mcd at a forward current (If) of 20.52mA.
Intensity value is higher than expected mainly due to the narrow viewing angle.
Forward voltage (Vf) is 1.990 volts across this LED at 20.52mA.




5mm water-clear NIR LED, $0.05, www.hebeiltd.com.cn..., 514EIR1C
(No minimum order required)
(Received 11-08-04 tested 04-17-05)

This is a 5mm round near-infrared (NIR) LED in a water-clear epoxy case.


Here is a macro photograph of the business-end of the LED itself, while energized at a drive current of 20.52mA with a Vf of 1.182 volts.

Due to the fact that this LED is infrared, I am not able to obtain intensity measurements from it.
My best guess is that this LED radiates a peak wavelength of 940nm.



5mm water-clear RGB LED, $0.59, www.hebeiltd.com.cn..., 5B8RGBW-D2-CC
(No minimum order required)
(Received 11-08-04 tested 03-16-05)

This is a 5mm round RGB LED in a water-clear epoxy case.

The light it outputs varies in wavelength depending on how you drive the three dice inside. The blue die emits a dominant wavelength (where you would point to on a color chart) of approximately 471nm, the green die 525nm, and the red die 638nm.

The beam that comes out of this LED is a wide, smooth flood, and has no rings, spots, or other little evil things (artifacts) in it.

The total beam width is approximately 120.


Here is a photograph of the LED itself.


In this photograph, each die was receiving ~8.9mA.
That's why it appears bluish-green.

Due to the way this LED was constructed, I was not able to obtain intensity or Vf measurements from it.

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



5mm water-clear yellow LED, $0.05, www.hebeiltd.com.cn..., 5T47LY5C
(No minimum order required)
(Received 11-08-04 tested 03-16-05)

This is a 5mm round yellow LED in a water-clear epoxy case.

The light it outputs is a slightly amberish-yellow. It has a dominant wavelength (where you would point to on a color chart) of approximately 590nm.

The beam that comes out of this LED consists of a square central hotspot with a dimmer zone inside that, surrounded by a noticeably dimmer region outside the hotspot, which is then surrounded by a brighter penumbra, surrounded by a dim corona.

The total beam width (hotspot and penumbra) is approximately 18.


Intensity is 4,990mcd at a forward current (If) of 20.52mA.
Forward voltage (Vf) is 1.992 volts across this LED at 20.52mA.




IR control module, $0.29, www.hebeiltd.com.cn..., PL-IRM0101-3
(No minimum order required)
(Received 11-08-04 NOTtested 03-16-05)

This is an infrared receiver module.
Unless some 940nm NIR LEDs are in the latest package I received from Hebei I.T. Shanghai, I will not be able to test this device.
The web page you can find this device on is right here if you're interested.


Here is a photograph showing both the front and back of these modules.



3mm water-clear red LED, $0.05, www.hebeiltd.com.cn..., L314HURC-A-T
(No minimum order required)
(Received 11-08-04 tested 03-16-05)

This is a 3mm round red LED in a water-clear epoxy case.

The light it outputs is a very, very slightly orangish-red. It has a dominant wavelength (where you would point to on a color chart) of approximately 640nm.

The beam that comes out of this LED consists of a square central hotspot with a dimmer zone inside that, surrounded by a thin, slightly but noticeably dimmer "four leaf clover" region outside the hotspot, which is then surrounded by a brighter penumbra, surrounded by a dim corona.

The total beam width (hotspot and penumbra) is approximately 15.


Intensity is 1,570mcd at a forward current (If) of 20.52mA.
Forward voltage (Vf) is 1.897 volts across this LED at 20.52mA.



Spectrographic plot
Spectrographic analysis of this LED.



5mm water-clear yellow-green LED, $0.05, www.hebeiltd.com.cn..., L5T34VG3C-D2-AH
(No minimum order required)
(Received 11-08-04 tested 03-15-05, spectroscopy performed 08-07-08)

This is a 5mm round yellow-green LED in a water-clear epoxy case.

The light it outputs is a typical yellow-green for a yellow-green LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 568nm.

The beam that comes out of this LED consists of a relatively even hotspot, surrounded by a dim corona.

The total beam width is approximately 20.


LED light is significantly more greenish than is depicted in this photograph.
Intensity is 740mcd at a forward current (If) of 20.52mA.
Forward voltage (Vf) is 1.998 volts across this LED at 20.52mA.


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



5mm water-clear yellow-green LED, $0.05, www.hebeiltd.com.cn..., L5T34VG3C-AH
(No minimum order required)
(Received 11-08-04 tested 03-14-05)

This is a 5mm round yellow-green LED in a water-clear epoxy case.

The light it outputs is a typical yellow-green for a yellow-green LED. It has a dominant wavelength (where you would point to on a color chart) of approximately 568nm.

The beam that comes out of this LED consists of a square central hotspot, a dimmer ring outside that, a brighter ring outside that, and a dim corona.

The total beam width is approximately 15.


LED light is significantly more greenish than is depicted in this photograph.
Intensity is 1,640mcd at a forward current (If) of 20.52mA.
Forward voltage (Vf) is 1.987 volts across this LED at 20.52mA.




5mm water-clear blue LED, $0.14, www.hebeiltd.com.cn..., L5B47UBC-D1
(No minimum order required)
(Received 11-08-04 tested 03-14-05)

This is a 5mm round blue LED in a water-clear epoxy case.

The light it outputs is an almost-pure, very, very, very slightly greenish-blue. It has a dominant wavelength (where you would point to on a color chart) of approximately 473nm.

The beam that comes out of this LED consists of a central hotspot, and a slightly but noticeably dimmer penumbra with a sharp fall-off to extinction at its outer perimeter.

The total beam width is approximately 30.


Intensity is 1,410mcd at a forward current (If) of 20.52mA.
Forward voltage (Vf) is 3.179 volts across this LED at 20.52mA.




5mm water-clear white LED, $0.46, www.hebeiltd.com.cn..., L5T47VW5C-AHV
(No minimum order required)
(Received 11-08-04 tested 03-08-05)

This is a 5mm round white LED in a water-clear epoxy case.

The light it outputs is a slightly bluish-white. It has an approximate color temperature of 5,750K.

The beam that comes out of this LED consists of a central hotspot, softly falling off to extinction at its outer perimeter.

The total beam width is approximately 20.


Intensity is 12,790mcd at a forward current (If) of 25.5mA.
Forward voltage (Vf) is 3.011 volts across this LED at 25.5mA.




The first 5mm Hebei I.T. Shanghai Co. Ltd. LED was powered with a Hosfelt Electronics LED tester, outputting a known current of 25.5mA from the receptacles the LED was tested in.

All subsequent 3mm, 5mm, 8mm, and 10mm LEDs on this and future web pages will be tested in a GLOW-ON, LLC. LED tester that outputs a known current of 20.52mA on its 20mA setting.

High-flux ("spider") LEDs were powered with an Energy One XP-4 variable voltage, variable current power supply, with the current set to the individual LED under test.




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.

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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
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