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HEBEI I.T. SHANGHAI CO. LTD. LEDS (3)

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 fourth page is right here, and the fifth page is right here if you're interested.

8mm Green LED, $0.41, www.hebeiltd.com.cn..., L8147LPG41C-AHV
(No minimum order required)
(Received and tested 08-25-04)

This is an 8mm LED in a water-clear epoxy case.
The light it outputs is a bright, slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 524-527nm.

The beam that comes out of this LED consists of a slightly blotchy hotspot, surrounded by a slightly but noticeably dimmer penumbra, surrounded by a dim corona. This is fairly typical of non-phosphor 8mm and 10mm LEDs in clear packages with moderate viewing angles.

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


Intensity is 10,460mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 3.34 volts across this LED.




5mm Blue LED, $0.44, www.hebeiltd.com.cn..., L5B47VB5C-D2-AHV
(No minimum order required)
(Received and tested 08-25-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a vibrant blue, with a dominant wavelength (where you would point to on a color chart) of approximately 466-470nm.

The beam that comes out of this LED consists of a slightly blotchy annular hotspot, surrounded by a slightly but noticeably dimmer penumbra, surrounded by a dim corona. This is fairly typical of non-phosphor 5mm LEDs in clear packages with moderately wide viewing angles.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 45 wide.


Intensity is 1,560mcd at a forward current (If) of 26mA.
According to the manufacturer, this should be 2,000mcd - my light meter very likely loses sensitivity in the blue region of the spectrum.
Remember, wider viewing angles always give lower mcd values.
Forward voltage (Vf) is 3.57 volts across this LED.




5mm Green LED, $0.33, www.hebeiltd.com.cn..., L5T47LPG41C-D1-AHV
(No minimum order required)
(Received and tested 08-25-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 524-527nm.

The beam that comes out of this LED consists of a wide hotspot, surrounded by a dim corona. This is fairly typical of non-phosphor 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 to 25 wide.


Intensity is 5,680mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 3.10 volts across this LED.




5mm White LED, $0.21, www.hebeiltd.com.cn..., L5B47UWC-D1-AHV
(No minimum order required)
(Received and tested 08-25-04)

This is a 5mm LED in a water-clear epoxy case.
The light it outputs is a cool white, with a very slightly purplish color. Estimated color temperature is 7,000K.

The beam that comes out of this LED consists of a very wide hotspot, surrounded by a dim corona. This is fairly typical of phosphor-type wide-angle 5mm LEDs in clear packages.
The beam from this LED is remarkably smooth and even, with no blotches, blue rings, or other evil little things in there.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam is approximately 50 to 60 wide.


Intensity is 2,470mcd at a forward current (If) of 26mA.
Remember, wider viewing angles always, always give lower mcd values.
Forward voltage (Vf) is 3.52 volts across this LED.




10mm White LED, $0.55, www.hebeiltd.com.cn..., L8347VW5C-AHV
(No minimum order required)
(Received and tested 08-25-04)

This is a 10mm LED in a water-clear epoxy case.
The light it outputs is a cool white, with a very slightly purplish color. Estimated color temperature is 7,000K.

The beam that comes out of this LED consists of a wide hotspot, surrounded by a dim corona. This is fairly typical of phosphor-type 10mm LEDs in clear packages.
The beam from this LED is remarkably smooth and even, with no blotches, blue rings, or other evil little things in there. There is a faint ring within the hotspot itself, but it is not at all bothersome.

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


Intensity is 4,780mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 3.43 volts across this LED.




5mm Green LED, $0.33, www.hebeiltd.com.cn..., L5B47LPG41C-D2-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 bright, slightly whitish green, with a dominant wavelength (where you would point to on a color chart) of approximately 524-527nm.

The beam that comes out of this LED consists of a central hotspot, surrounded by a slightly but noticeably dimmer penumbra, surrounded by a dim corona. This is fairly typical of non-phosphor, 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 approximately 65 to 70 wide.


Intensity is 4,590mcd at a forward current (If) of 26mA.
Remember, wider viewing angles always equal lower mcd values.
Forward voltage (Vf) is 3.34 volts across this LED.




5mm Red LED, $0.10, www.hebeiltd.com.cn..., L5T34VE6C-D2-AH
(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 bright, slightly orangish red, with a dominant wavelength (where you would point to on a color chart) of approximately 622-626nm.

The beam that comes out of this LED consists of a smooth, wide central hotspot, surrounded by a dim corona. This is fairly typical of non-phosphor 5mm LEDs in clear packages. There are no rings, blotches, or other evil little things in this LED's beam.

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


Intensity is 3,860mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 1.97 volts across this LED.




5mm Red LED, $0.10, www.hebeiltd.com.cn..., L5T34VE6C-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 bright, slightly orangish red, with a dominant wavelength (where you would point to on a color chart) of approximately 625-630nm.

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

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam (hotspot and penumbra) is approximately 20 to 25 wide.


Intensity is 5,040mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.03 volts across this LED.




5mm Red LED, $0.05, www.hebeiltd.com.cn..., L5T47HURC-A
(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 bright, 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 slightly but noticeably dimmer circular penumbra, surrounded by a dimmer yet sub-umbra (dimmer than the penumbra, but brighter than the corona), surrounded by a dim corona. This beam configuration is fairly typical of non-phosphor 5mm LEDs in clear packages.

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam (hotspot and penumbra) is approximately 15 to 18 wide.


Intensity is 3,540mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.11 volts across this LED.




5mm Amber LED, $0.06, www.hebeiltd.com.cn..., L5T47VY3C-D2-AH
(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 bright amber-yellow, with a dominant wavelength (where you would point to on a color chart) of approximately 584-587nm.

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

I do not have an instrument for measuring viewing angles, but in my estimation, the main beam (hotspot and penumbra) is approximately 20 to 25 wide.


Light color is significantly less reddish than this photograph makes it appear.
Intensity is 3,790mcd at a forward current (If) of 26mA.
Forward voltage (Vf) is 2.17 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.




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WHITE 5500-6500K InGaN+phosphor 
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YELLOW-GREEN 555-575mn GaAsP & related
YELLOW 585-595nm
AMBER 595-605nm
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INFRARED 700-1300nm
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