One should pay special attention to the difference between rated lumen, luminaire and rated lumen, lamp, which is measured on the LED module. Previously, LED manufacturers listed the lumen output at a junction temperature of 25 degrees, or so-called cold lumens. The junction temperature is measured inside the diode itself. Today, a more common denomination is to use hot lumens, i.e. lumens measured at an ambient temperature of 25 degrees, which correspond to a much higher junction temperature.
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