Long Pass Filters (LPF)

Cold Mirrors/IR Bandpass Filters

A cold mirrors or an IR bandpass filter is an optical filter design that allows only IR wavelength or certain IR wavelength to pass through and blocks the visible wavelength.
Colored Glass-IR Bandpass Filters
An IR bandpass filter offers high IR transmission and visible light reflection which can be applied to Infrared devices or automatic detection systems while sensors with IR bandpass filters will only detects infrared radiation.
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