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NICHIA LEDs

NSPL510S 5mm WARM WHITE LED, www.nichia.com
(Received 02-26-05, tested 02-27-05

This LED, packaged in a standard water-clear epoxy case, 5mm (T1 3/4) in size, through-hole in configuration. It is Nichia's warm white wide viewing angle lamp.

The beam from this LED has a viewing angle of 50°, and is fairly even throughout its illuminated area, with a very slightly brighter ring near the outer perimeter. This is typical of 5mm round white LEDs with wide viewing angles, and is nothing whatsoever to be concerned about. Color temperature appears to be approximately 4,300°K.


Measures 3,310mcd on a Meterman LM631 light meter.
Viewing angle is 50°; remember, wider viewing angles always equal lower mcd values.
Test current was 25.5mA in my Hosfelt Electronics LED tester.
LED light is slightly more yellow than this photograph depicts.



Nichia NSPL510S Warm-white LED
(Received 12-29-04, tested 09-05-05)

A fan of the website sent me three of these lamps, along with several other types of LEDs and several flashlights in late-December 2004.

This is a warm white LED, packaged in a standard water-clear epoxy case, 5mm in size, through-hole in configuration.

The beam from this LED has a viewing angle of ~50°, and consists of a wide, circular yellowish-white area, with a dimmer area right in the center. This dimmer central area is perfectly normal for wide-angle Nichia LEDs, and is nothing whatsoever to be concerned about.

Color temperature appears to be approximately 3,650°K.


Light is slightly less yellow than as depicted in this photograph.
Measures 1,580mcd on a Meterman LM631 light meter.
Viewing angle is ~50°.
Remember, wider viewing angles ALWAYS equal lower mcd values.
Test current was 19.28mA at a Vf of 3.160 volts in my American Opto Plus tester.



NCLU001 SMD NUV POWER LED ("Sirius"), www.nichia.com
(Received 10-12-04, NOT tested 11-18-04)

I say *not* tested because the LED is totally leadless, has an unusual configuration of pads on the bottom for electrical connection, and the mounting board I was later provided with appears to require reflow soldering - a connection method I'm totally unequipped to deal with.
So, unless somebody out there is equipped to do reflow soldering for me, this LED will not be tested.

(Update 01-16-05) As of 01-13-05, I have sent one of the LEDs and the circuit board for it that was later provided to somebody who says he can solder them.
So I may in fact be able to test this LED after all.

(Update 02-25-05) Finally, I have one of these LEDs soldered to leads and attached to a generous heatsink. The device outputs a deep whitish-violet glow, with most of its radiation centered at 380nm in the UVA (ultraviolet-A) portion of the spectrum.


Here is a photograph of the LED itself, showing six bond wires and at least three dice (light-emitting regions).
I am not equipped to measure the LED's power output, nor am I yet equipped to run a spectrographic analysis on it.


Forward current (If) was 490mA and forward voltage (Vf) was 4.02 volts DC for this photograph.
Photograph shows a bright magenta color that does not exist in the actual LED's output. Light appears as a dim whitish-violet to the eye.

Spectrographic plot
Spectrographic analysis of this LED.
That hump in the deep red is a second-order reflection from the spectrometer's grating and may be disregarded.


Spectrographic plot
Same as above; different spectrometer & software.



NSPW500CS 5mm WHITE LED, www.nichia.com
(Received & tested 02-22-05

This LED, packaged in a standard water-clear epoxy case, 5mm (T1 3/4) in size, through-hole in configuration. It is advertised to be the brightest 5mm white LED that Nichia has developed to date.

The beam from this LED consists of a slightly bluish-white hotspot, surrounded by a slightly greenish-white corona. This is typical of 5mm round white LEDs, and is nothing whatsoever to be concerned about.

The NSPW500CS is available now.
Leadtime is about 3 weeks
It is not currently available off the online store, but it will be soon.


Measures 29,200mcd on a Meterman LM631 light meter.
Test current was 25.5mA in my Hosfelt Electronics LED tester.



NCCL022 SMD POWER LED, www.nichia.com
(Received 10-12-04, tested 10-18-04)

This is one of at least six power LEDs I'll be placing on this web page.

This is a power SMD LED in a fairly unusual package.
The light it outputs is a warm white color, with an estimated color temperature of just 3,000°K. I do not have an instrument for measuring color temperature, so I kinda have to guess here.

The beam that comes out of this LED is very smooth and even, with no rings, blotches, or other evil little things in it.

I do not have an instrument for measuring viewing angles, but in my estimation, the beam is approximately 70° wide.


The target I normally use hasn't yet been found (I'm moving), so I placed a 12" ruler on the wall to help provide a reference. The LED becomes hot pretty fast when used in this manner (without heatsinking), so I did not have a lot of time to set this photograph up.

Intensity is 22,500mcd at a forward current (If) of 356mA.
Remember, wider viewing angles *always* equal lower mcd values.
Forward voltage (Vf) is 3.33 volts across this LED.



NCCW022 SMD 70° POWER LED, www.nichia.com
(Received and tested 03-17-04)
This is Nichia's latest LED to show up in the high-powered LED wars. This is labelled as a SMD LED, even though it seems large for an SMD component. But it has a flat base with the leads going off to the sides, so it can indeed sit flush on a PCB or what have you.


Here are a couple of pictures, showing the new LED both at an isometric angle and from above.

The web page referencing these new LEDs is http://www.nichia.co.jp/product/led-smd-powerled.html if you're interested.


This LED is rated to deliver 23 lumens of light, however I cannot measure lumens because you need a special instrument called an "integrating sphere" to do that, and I don't own or have access to one. And readings in mcd (millicandelas) will seem awfully low, because this LED has a wide viewing angle of 70°. If the beam were focused with an optic or a lens, values above 200,000mcd aren't unreasonable.

The Vf of this LED can range from 3.8 to 4.3 volts DC, and you're supposed to supply 350mA to it - 500mA maximum - with proper heatsinking of course.

A flashlight using this LED was supplied with the LED itself, and it has a bright, surprisingly wide beam, even though it's focused with an aspherical lens. The link to this flashlight is right here if you're interested.

The LED itself is very new, and I don't believe it is on the Nichia website or the Nichia Light Emitting Diode 2004 catalogue yet.



All intensity measurements on this web page were made with a Meterman LM631 light meter, and unless otherwise stated, the LEDs were powered with an Energy One XP-4 power supply.



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