If you check the datasheets, all the "670nm" LEDs available on Mouser appear to ...

		mrob on Feb 1, 2023 \| parent \| context \| favorite \| on: Morning exposure to deep red light improves declin... If you check the datasheets, all the "670nm" LEDs available on Mouser appear to be 660nm LEDs that are specified with a maximum wavelength tolerance of 670nm. I think it's unlikely you'll get any 670nm LEDs if you buy them.