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United Epitaxy Co. LEDs
A strip of UEC LEDs in five colors.
From left to right: red, amber, blue, green, white


And here's a UEC LED, compared in size with an ordinary 5mm through-hole LED.


United Epitaxy Co., Taiwan White LED, part # EOH-SAWCB0
Received and tested on 08-09-04; retested with the correct parameters on 08-10-04
This is a small, square LED in a flat, SMD-like package. It is the white version, the first of five UEC LEDs to appear on this page. There is a metal plate on the bottom of the LED package for heat sinking purposes. This plate is electrically isolated from the anode (+) and cathode (-) connections. It is recommended you heatsink this and other UEC LEDs on this page if you drive them over 150mA.

The cathode (-) connection is identified by a chamfered edge on the top of the LED's white plastic housing. This applies to all UEC LEDs on this page, so I don't need to keep repeating it.

Photograph of the chamfer or notch cut into the corner of the LED on the side where the cathode (-) connection is.

The die (light-emitting chip) is not lensed, so the LED has a wider than usual viewing angle of approximately 110°. I do not have an instrument to measure this though, so this is an eyeballed value.

This is a phosphor white LED. The color temperature of the tested unit is approximately 7,000°K, which appears as a cool, slightly greenish-blue white.


Brightness measures 12,900mcd on a Meterman LM631 light meter.
Viewing angle is estimated at 110° - later confirmed by the spec sheet.
Remember, wider viewing angles always equal lower mcd values.

Vf is 3.04 volts at 355mA. Forward current is 355mA (0.355 amps) on my Energy One XP-4 variable voltage power supply that I used for this test, and that I will use for subsequent tests on this page.

I initally tested this LED at 20mA; since receiving the spec sheets, I have increased the drive current and re-tested, re-measured, and re-photographed it.



United Epitaxy Co., Taiwan Blue LED, part # EOH-SABEB0
Received and tested on 08-09-04; retested with the correct parameters on 08-10-04
This is a small, square LED in a flat, SMD-like package. It is the blue version. There is a metal plate on the bottom of the LED package for heat sinking purposes. This plate is electrically isolated from the anode (+) and cathode (-) connections.

The die (light-emitting chip) is not lensed, so the LED has a wider than usual viewing angle of approximately 110°. I do not have an instrument to measure this though, so this is an eyeballed value.

The estimated dominant wavelength (where you would point to on a color chart) of this LED is 465-467nm, which is a true blue.


Brightness measures 4,620mcd on a Meterman LM631 light meter.
Viewing angle is estimated at 110° - later confirmed by the spec sheet.
Remember, wider viewing angles always, always equal lower mcd values.

Vf is 3.47 volts at 355mA.

I initally tested this LED at 20mA; since receiving the spec sheets, I have increased the drive current and re-tested, re-measured, and re-photographed it.



United Epitaxy Co., Taiwan Green LED, part # EOH-SAFEB0
Received on 08-09-04; tested on 08-10-04
This is a small, square LED in a flat, SMD-like package. It is the green version. There is a metal plate on the bottom of the LED package for heat sinking purposes. This plate is electrically isolated from the anode (+) and cathode (-) connections.

The die (light-emitting chip) is not lensed, so the LED has a wider than usual viewing angle of 110°.

The estimated dominant wavelength (where you would point to on a color chart) of this LED is 527-529nm, which is a true green. Slightly whitish if the LED is viewed directly, not whitish if you view the reflected light.


Brightness measures 26,900mcd on a Meterman LM631 light meter.
Viewing angle is 110°.
Remember, wider viewing angles always, always, ALWAYS equal lower mcd values.

Vf measured at 3.30 volts at 355mA.



United Epitaxy Co., Taiwan Yellow LED, part # EOH-SAYEB0
Received on 08-09-04; tested on 08-11-04
This is the last UEC LED I have for you at the moment. This is a small, square LED in a flat, SMD-like package. It is the yellow version. There is a metal plate on the bottom of the LED package for heat sinking purposes. This plate is electrically isolated from the anode (+) and cathode (-) connections.

The die (light-emitting chip) is not lensed, so the LED has a wider than usual viewing angle of 110°.

The estimated dominant wavelength (where you would point to on a color chart) of this LED is 585-588nm, which is a slightly amberish, almost sodium yellow.
Sodium yellow is around 594nm, so this LED's output is pretty close - just a little less orangish.


LED light is significantly less orangish than this photograph makes it appear.
Brightness measures 16,190mcd on a Meterman LM631 light meter.
Viewing angle is 110°.
Remember, wider viewing angles always, always, ALWAYS equal lower mcd values.

Vf measured at 2.31 volts at 360mA.



United Epitaxy Co., Taiwan Red LED, part # EOH-SAREB0
Received on 08-09-04; tested on 08-11-04
This is a small, square LED in a flat, SMD-like package. It is the red version. There is a metal plate on the bottom of the LED package for heat sinking purposes. This plate is electrically isolated from the anode (+) and cathode (-) connections.

The die (light-emitting chip) is not lensed, so the LED has a wider than usual viewing angle of 110°.

The estimated dominant wavelength (where you would point to on a color chart) of this LED is 625-630nm, which is a slightly orangish red.


Brightness measures 17,240mcd on a Meterman LM631 light meter.
Viewing angle is 110°.
Final reminder for today: Wider viewing angles always, always, ALWAYS equal lower mcd values.

Vf measured at 2.26 volts at 373mA. 



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
Where to buy these LEDs 
Links to other LED-related websites
The World's First Virtual LED Museum
Legal horse puckey, etc.
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