Ah - we worked with lighting LEDs, so 450 nM - "royal blue".
All illumination LEDs actually make light at this wavelength, and are coated with phosphor to absorb some portion of this wavelength, and reradiate it at a variety of longer wavelengths, or colors. Our eye mixes all this together as various degrees of "white". There are a couple of boutique LED makers that use a 405 nM "pump" to get some more energy in the near UV area.
He was a smarter guy (a couple Masters degrees as well), but I think I have more patents.
That's better, right?
Forrest

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