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Doug Owen said:
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OddOne said:
My brother has one of every color you can get a 1W Luxeon Star in, and they ALL have bin codes on the back.
And, as is so strongly the case for the white ones, the colored ones can have huge variations in actual emission wavelength - he has a blue that's cyan and a cyan that's green, according to the bin codes.
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While I try to never argue with the guy with real experience, a recheck might be in order?
The bins are 5 nm wide, generally 6 in number (with exceptions) and *there is no overlap*:
Blue 460 to 490 nm in 6 bins
Cyan 490 to 520 nm in 6 bins
Green 520 to 550 nm in 6 bins
If you will, a 'bin 7 Cyan' would be marked as a bin 1 Green. It's like resistor values, no matter what the exact value, it fits into one of the 5% standard values.
For sure colors can be very subjective (something that those of us who are color blind need to deal with often), but the emission of the LED is subject to accurate, calibrated measurement.
Mismarked parts are, of course, possible. At the risk of being buried in 'BS, I've got one here...' responses, I'll bet they're highly uncommon. Great attention seems to be paid to this at the factory.
Doug Owen
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Doug, I think what he is saying is , for example, he has a cyan that looks green. A bin 6 cyan looks green to my eye.