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Multiple excitation sources, a xenon flashlamp and ultraviolet light-emitting diodes (UV LEDs), were used to their advantages. A photomultiplier tube module, gated to reject time-domain interferences, was used as a photodetector. Using danofloxacin as a model analyte, luminescence signal was linear in more than three decades (0.5\u20132000 ng\/mL) with R<jats:sup> 2 <\/jats:sup> &gt; 0.998 in each decade. This photometer achieved a limit of detection of 2.0 ng\/mL with 1.3% average relative standard deviation. 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