BP365 UV bandpass filters are suitable for use with UV LEDs, UV fluorescent lamps and other UV-generating lamps. The BP365 optical filter is designed to transmit both visible light and UV light, including 395 nm and all common UV LED wavelengths. It is also suitable for near-UV fluorescence imaging by blocking visible light and light from UVC LED excitation sources and enabling the early removal of biofilms (e.g. in disinfection applications or biofouling of ship hulls) by tryptophan fluorescence detection. The filter is made of borofloat with a low expansion, which makes it particularly heat-resistant.