1500nm is way outside the the range of usable solar radiation in nature. https://upload.wikimedia.org/wikipedia/commons/e/e7/Solar_spectrum_en.svg https://uplo

1500nm is way outside the the range of usable solar radiation in nature. https://upload.wikimedia.org/wikipedia/commons/e/e7/Solar_spectrum_en.svg https://upload.wikimedia.org/wikipedia/commons/e/e7/Solar_sp... Snakes pick back up around 5000nm since that's the temperature other living animals radiate, which is helpful in hunting. https://en.wikipedia.org/wiki/Infrared_sensing_in_snakes https://en.wikipedia.org/wiki/Infrared_sensing_in_snakes