Cree has published a document in which 2 of their brand new XR-E LEDs are tested according to the NIST (National Institute of Standards and Technology) standards. Tests were run 5 minutes after the LEDs were powered so they are running stable in this test. The LEDs were marked as X1 and W3. I have no idea what this means, as far as I can see no flux bin or tint bin is specified.
Here it is : http://www.cree.com/products/pdf/NIST XLamp LED Document.pdf (PDF file)
Anyway, I found these results in which I am most interested :
- average voltage of 3.183 V at 350 mA (in my opinion a nice low voltage, and according to other CPF members' tests it will not raise as much as a Luxeon LED when running at 700 mA)
- average color temperature of 6045 K
- average CRI index of 78 (in my opinion good enough for home lighting, for which I have planned a project )
- average flux of 84.00 lumen ( :rock: )
- average efficacy of 75.4 lumen/W ( )
- relative spectral power distribution graphs can be seen in the document
Very good results in my opinion! These XR-E's do what was promised by Cree
Cheers!
Here it is : http://www.cree.com/products/pdf/NIST XLamp LED Document.pdf (PDF file)
Anyway, I found these results in which I am most interested :
- average voltage of 3.183 V at 350 mA (in my opinion a nice low voltage, and according to other CPF members' tests it will not raise as much as a Luxeon LED when running at 700 mA)
- average color temperature of 6045 K
- average CRI index of 78 (in my opinion good enough for home lighting, for which I have planned a project )
- average flux of 84.00 lumen ( :rock: )
- average efficacy of 75.4 lumen/W ( )
- relative spectral power distribution graphs can be seen in the document
Very good results in my opinion! These XR-E's do what was promised by Cree
Cheers!
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