This web page will be for nothing but spectra of a rare, antique "two-chip yellow" LED from the mid-1970s (most likely mid-1976).
Its operating chemistry appears to be GaP (gallium phosphide) red and GaP (gallium phosphide) yellow-green; both dice (light-emitting chips) appear to be connected in parallel with one another.

Ocean Optics USB2000 Spectrometer donated by P.L.
As of 10-10-07, I've been using a PC2000-ISA Spectrometer from Ocean Optics that I received several years ago, but that I didn't have a home for until now.
As of 03-08-08, I once again have the USB2000 spectrometer, enabling color spectra again.
As of 09-19-09, I no longer have the PC2000-ISA; it was sold to prevent an eviction.


Spectrographic analysis

Spectrographic analysis
Red; spectrometer's response narrowed to a band between 640nm and 680nm to pinpoint peak wavelength, which is 664.80nm.

Spectrographic analysis

Spectrographic analysis
Reddish-orange; spectrometer's response narrowed to a band between 600nm and 640nm to pinpoint peak wavelength, which is 615.80nm.

Spectrographic analysis
Yellow-green. Note the "hump" in the red.

Spectrographic analysis Yellow-green; spectrometer's response narrowed to a band between 530nm and 570nm to pinpoint peak wavelength, which is 554.15nm.

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.

Please visit this web page for contact information.

Unsolicited flashlights, LEDs, and other products appearing in the mail are welcome, and it will automatically be assumed that you sent it in order to have it tested and evaluated for this site.
Be sure to include contact info or your company website's URL so visitors here will know where to purchase your product.

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
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
The Punishment Zone - Where Flashlights Go to Die
Legal horse puckey, etc.
LEDSaurus (on-site LED Mini Mart)

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If you arrived on this page through an outside link,you can get the "full meal deal" by clicking here.