Well, the output may *peak* at 410nm, but It's a curve, with decreasing output the further you go on either side of 410. So seeing some violet output is not at all surprising. It's been a while, but I think violet is somewhere around
450, and blue is around 480 and onward.
Depending on who you ask...
Violet stops and blue starts at 420-450, and blue ends and green starts around 490-500...
And the band is not symmetric, falling off more sharply on the shortwave side than on the longwave side. Blue and green LEDs also generally do that.
Also, they called wavelengths 400 nm and longer (but shorter than blue), and sometimes even as short as 380 nm, visible violet until these LEDs came onto the market.
- Don Klipstein ( snipped-for-privacy@misty.com)
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