with luminescent coatings for influencing the sensitivity of the tube, e.g. by converting the input wavelength

Full Title

Photoelectric discharge tubes not involving the ionisation of a gas (H01J49/00 takes precedence) > having photo- emissive cathode, e.g. alkaline photoelectric cell (operating with secondary emission H01J43/00) > with luminescent coatings for influencing the sensitivity of the tube, e.g. by converting the input wavelength