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HEBEI I.T. SHANGHAI CO. LTD. LEDS (4)

I received another shipment of LEDs from Hebei I.T. Shanghai Co. Ltd. on 08-25-04.
The first page is right here, the second page is right here, the third page is right here, and the fifth page is right here if you're interested.

5mm White LED, $0.21, www.hebeiltd.com.cn..., L5T47UWC-AHV
(No minimum order required)
(Received 08-25-04, tested 08-26-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a very slightly cool white, coming in at approximately 6,000K.

The beam that comes out of this LED consists of a smooth hotspot with a soft fall-off at its perimeter, surrounded by a dim corona. This is fairly typical of phosphor-type 5mm LEDs in clear packages.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 20 wide.


Intensity is 5,670mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 3.31 volts across this LED.




Oval 5mm Green LED, $0.33, www.hebeiltd.com.cn..., L763LPG41C-AHV
(No minimum order required)
(Received 08-25-04, tested 08-27-04)

This is an oval or "cat's eye" 5mm LED in a water-clear epoxy case.
The light it outputs is a very slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 523-527nm.

The beam that comes out of this LED consists of a wide, slightly annular oval-shaped hotspot, surrounded by a dim corona. This is a beam configuation I have not encountered before, so I have no basis with which to perform a comparative analysis.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 50 wide by approximately 25 to 30 tall.


Intensity is 9,280mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 3.44 volts across this LED.




Flat-top (lensless) 5mm White LED, $0.21, www.hebeiltd.com.cn..., L5N47UWC-AHV
(No minimum order required)
(Received 08-25-04, tested 08-27-04)

This is a flat-top (lensless) 5mm LED in a water-clear epoxy case.


Here's a photograph of the LED itself, showing the dome end is truncated and flat.

The light it outputs is a pure, slightly cool white, with an estimated color temperature of 6,800K.

The beam that comes out of this LED is a smooth, broad flood.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 135.


Intensity is 720mcd at a forward current (If) of 26mA.
Remember, wider viewing angles always equal lower mcd
values, and this lamp has a very, VERY wide viewing angle.
Photograph makes beam appear brighter than it actually is.
Forward voltage (Vf) is 3.85 volts across this LED.




5mm Amber LED, $0.07, www.hebeiltd.com.cn..., L5T47VY3C-AH
(No minimum order required)
(Received 08-25-04, tested 08-27-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is an amber yellow color, with a dominant wavelength (where you would point on a color chart) of 584nm to 588nm.

The beam that comes out of this LED consists of a central hotspot, surrounded by a slightly ringy penumbra, surrounded by a dim corona. This is fairly typical of non-phosphor-type 5mm LEDs in clear packages.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 12 to 15 wide.


Light is considerably less reddish than this photograph makes it appear.
Intensity is 6,091mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.12 volts across this LED.




Lensless 5mm Red LED, $0.05, www.hebeiltd.com.cn..., L5N47HURC-A
(No minimum order required)
(Received 08-25-04, tested 08-27-04)

This is a flat top (lensless) 5mm LED in a water-clear epoxy case.


Here's a photograph of the LED itself, showing the dome end is truncated and flat.

The light it outputs is a vivid red, with a dominant wavelength (where you would point on a color chart) of 630nm to 635nm.

The beam that comes out of this LED is a wide, even flood. I have not seen a lensless LED like this before, so I have nothing to compare it with.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 140 wide.


LED has a very wide viewing angle, and did not photograph well for that reason.
This photograph makes the beam appear *MUCH* brighter than it actually is.

Intensity is 370mcd at a forward current (If) of 26mA.
Remember, wider viewing angles always equal lower mcd values; and this LED has a VERY wide viewing angle.
Forward voltage (Vf) is 2.06 volts across this LED.


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



5mm Green LED, $0.33, www.hebeiltd.com.cn..., L5B47LPG41C-D1-AHV
(No minimum order required)
(Received 08-25-04, tested 08-28-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a very slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 523-527nm.

The beam that comes out of this LED consists of a slightly ringy central hotspot, surrounded by a slightly dimmer penumbra with a sharp perimeter, surrounded by a very dim corona.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 30.


Intensity is 8,650mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 4.01 volts across this LED.




5mm Red LED, $0.05, www.hebeiltd.com.cn..., L5B47HURC-D1-A
(No minimum order required)
(Received 08-25-04, tested 08-28-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a vivid, very slightly orangish red, with a dominant wavelength (where you would point to on a color chart) of approximately 630-635nm.

The beam that comes out of this LED consists of a squarish central hotspot, surrounded by a dimmer penumbra, surrounded by a brighter ring, surrounded by a very dim corona.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 35 to 40.


Intensity is 2,250mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.19 volts across this LED.




5mm White LED, $0.49, www.hebeiltd.com.cn..., L5B47VW5C-D2-AHV
(No minimum order required)
(Received 08-25-04, tested 08-29-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a very slightly cool white, coming in at approximately 6,000K.

The beam that comes out of this LED consists of a smooth, wide angle hotspot with a soft fall-off at its perimeter, surrounded by a dim corona. This is fairly typical of phosphor-type wide angle 5mm LEDs in clear packages.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is at least 50 wide.


Photograph makes the light appear brighter than it actually is.
Intensity is 1,800mcd at a forward current (If) of 26mA.
As always, wider viewing angles always equal lower mcd values.
Forward voltage (Vf) is 3.99 volts across this LED.




3mm White LED, $0.33, www.hebeiltd.com.cn..., L3142LPG41C-AHV
(No minimum order required)
(Received 08-25-04, tested 08-29-04)

This is a 3mm LED in a water-clear epoxy case.
The light it outputs is a very slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 523-527nm.

The beam that comes out of this LED consists of a circular central hotspot, surrounded by a dimmer penumbra, surrounded by a brighter ring, surrounded by a very dim corona. This is fairly typical of non phosphor-type 3mm LEDs in clear packages.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 20 wide.


Intensity is 7,520mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 4.22 volts across this LED.




5mm Red LED, $0.05, www.hebeiltd.com.cn..., L5T47UR5C-A
(No minimum order required)
(Received 08-25-04, tested 08-29-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a vivid red, with a dominant wavelength (where you would point to on a color chart) of approximately 640-645nm.

The beam that comes out of this LED consists of a squarish central hotspot, surrounded by a dimmer ring, surrounded by a brighter penumbra, surrounded by a very dim corona.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 15 to 20.


Intensity is 3,100mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.39 volts across this LED.




All 3mm, 5mm, 8mm, and 10mm Hebei I.T. Shanghai Co. Ltd. LEDs were powered with a Hosfelt Electronics LED tester, outputting a known current of 26mA from the receptacles the LEDs were tested in.
High-flux ("spider") LEDs were powered with a Mid-Eastern variable voltage, current-clamping 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
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