Playing with light sensors, data logging in MCU flash, and USB. The VEML3328 is pretty neat. RGB, clear (wide response photodiode) and IR and runs over I2C, and has a super wide range of possible sensitivities. I'm auto ranging it, and storing milli lux units compressed into 16 bits, using an 11 bit base and 5 bit shift exponent to store values for data logging.