I have ordered one erythemal, one UV-A and one blue light sensor. These are silicon carbide photodiodes with a built-in amplifier. They are made by sglux in Germany. They are small and relatively cheap. The UV ones are inherently visible blind.
Sensory and Physiological Ecology of Plants
Decoding the acquisition and use of information by wild and cultivated plant species
I have ordered one erythemal, one UV-A and one blue light sensor. These are silicon carbide photodiodes with a built-in amplifier. They are made by sglux in Germany. They are small and relatively cheap. The UV ones are inherently visible blind.