| In the "LED Bulbs and Modules" categories at Mouser, there are no 670 nm LEDs. In the "LED Indication - Discrete" category at Digi-Key, there are no 670 nm LEDs. (Digi-Key lets you filter on both peak and dominant wavelength. I assume peak is what we want here but it doesn't matter because there are no 670 nm dominant in those categories either). In the category "LED Emitters" Mouser does list 670 nm in the filter, but checking out a few of those it seems they all actually specify peak wavelength is 650-670 nm. I probably just missed it because I don't read German, but at led1.de I could not figure out how to filter on wavelength. Assuming one is just looking for some through hole LEDs to whip something up on a breadboard, it looks like the closest readily available inexpensive LEDs are 660 nm peak and 638 nm dominant at around $0.40. Typical example [1] which is $0.41 for one, $2.95 for 10. Since the article said 650-1000 nm, if we assume a peak of 700 nm works, then there are a lot of options, such as [2]. Dominant 635 nm. $0.29, 10 for $2.14. [1] https://www.digikey.com/product-detail/en/lite-on-inc/LTL-42... [2] https://www.digikey.com/product-detail/en/kingbright/WP3A8HD... |