A recent HaD article highlighted an LED array reflectance sensor for plastics identification. As it's obviously related to this project, I've rummaged around for another source of LED arrays for hyperspectral imaging, absorption / reflection spectrometry and spectral fingerprinting. Check out USHIO's 8-in-1 LED package with a miniature BGA footprint.

It's really becoming clear how these emitters could pave the way for hyperspectral imaging integrated into smartphones, as they are a lot better integrated than single LEDs. Smartphones might even be reworked to replace the LED light / flash with a multi-spectral source for such occasions.

I can also see how a repeating pattern of sequential light pulses can be combined with short exposure times and a rolling shutter sensor to extract a lower-resolution 2D hyperspectral image. Shout-out to [Jerry de Vos], [Armin Straller], and [Jure Vidmar] :)

https://www.ushio.eu/multi-wavelength-leds/