The visible blue light LED outlasts traditional filament bulbs by more than nine years, according to the manufacturer. Various models detect different ranges of luminescence.
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The LRT 440 series sensor from Leuze Lumiflex (Rockaway, NJ) detects luminescence in glue marks, labels, plastics, inks, etc. at a range of 50 mm (1.97").
The visible blue light LED outlasts traditional filament bulbs by more than nine years, according to the manufacturer. Various models detect different ranges of luminescence.