“…The use of an RL light source for photometric measurements is not new. − For example, RL light sources have been used in process monitoring, time-resolved fluorescence, ,,,, UV absorption, steady-state fluorescence, ,,,,,, flow injection analysis, and temperature sensing . In comparison to a conventional light source, an RL light source is more simple, reliable, and compact, it is less prone to induce photochemical reactions, it exhibits a highly stable emission intensity, , and the RL per se requires no electrical power.…”