Temperature configurable light-emitting diode (LED) array as a reconstructive spectrometer

We present a low-cost approach to reconstructive spectrometry using arrays of commercial light-emitting diodes (LEDs). Unlike existing systems that require expensive custom-made components, our method operates LEDs in photovoltaic mode to reconstruct spectral information. A key aspect is the use of temperature as a tuning parameter to boost reconstruction accuracy. This proof-of-concept enables the development of accessible spectrometers for portable field applications, which could be particularly relevant in agriculture and the food industry.