Osram's EQ-white LED emitters now available for sale

Anders Hoveland

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Sep 1, 2012
Messages
858
just wanted to bring this to everyone's attention,

Many of you have read of Osram's Brilliant Mix and Cree's TrueWhite LED technology. These basically combine a greenish-white LED with a red/amber LED to create a higher efficiency white light source.
The greenish-white LED is basically like a regular white LED except that more of the blue emission is converted by the phosphor, and the type of phosphor used is a little more green-shifted than what a regular LED phosphor would be for that particular color temperature. These greenish-white LEDs produced by Osram are referred to as "EQ-white".

I am not sure, this may be old news, but it may be of interest to anyone making a D.I.Y. LED array.

http://www.osram-os.com/osram_os/en...ng/oslon-ssl-150-white/luw-cqdp-eqw/index.jsp
http://www.osram-os.com/osram_os/en...ng/oslon-ssl-150-white/luw-crdp-eqw/index.jsp

Mouser carries some of them:
http://www.mouser.com/ProductDetail...-LTMP-MCML-1/?qs=znB0/8lYn%2bs%2bBGESg45IXQ==


These are somewhat comparable to Philip's phosphor-converted Luxeon Lime emitters, although of course instead of being entirely greenish-yellow lime colored, they are greenish-white. (also the Luxeon Lime uses a 430nm emitter, whereas the EQ-white series uses a 440nm diode emitter)

As you would expect, these EQ-white LEDs are highly efficient in terms of lumen output, 130-150 lumens/W.
 

JoakimFlorence

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Jun 4, 2016
Messages
137
I saw one of the new Osram bulbs that use the new "Brilliant Mix" technology. In the picture below you can see inside the bulb, there is a circle of 12 LEDs mounted onto the board, alternating between EQ-white LEDs and amber-red emitters.


BrilliantMix_1.jpg



https://www.led-professional.com/te...pro-classic-a-80-led-lamp-and-prevaled-system

The Parathom Pro Classic A80 bulb is 2700K, has a CRI >90 (92 CRI typical), and the combination of 2 different types of emitters give it a 30 percent higher luminous efficiency than a bulb with comparable color temperature and CRI that just used conventional white LEDs.
 

JoakimFlorence

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Jun 4, 2016
Messages
137
Also, the phosphor in these EQ-white LEDs appears to be greenish-yellow (the same type used in 70 CRI LED streetlamps), judging from the spectral graph in the datasheet. I think all the different color temperature versions are using the same phosphor; it is just that they are designed to be used with different ratios of red. The lower color temperature versions let less blue light through.

This is unlike standard white LEDs (around 82 CRI) that use 2 different color-shifted phosphors in the formulation.

This makes sense, because the Brilliant Mix concept is aiming for maximum efficiency, and the yellow-green part of the spectrum has the highest luminous efficacy. The phosphor does not need to generate red light because that is done by the amber emitter (I think Osram is using a 610-615 nanometer wavelength, really more orange than red).

The only downside is that the spectral graph of these EQ-white emitters do not look like they contain very much cyan, there's a very big dip between the blue and green.
 
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