A standard HPL 575 lamp produces approximately 16.5k lumens. An FEL 1kw lamp produces, according to every source I can find, produces 27.5k lumens.
But a Source 4 36 degree fixture lights up the stage far brighter than a 30 degree Berkey Colortran fixture. I know this. I’ve seen it. In addition it’s lighter, easier to focus, uses less electricity, and produces a cleaner beam because of the improved optics and reflector. So why am I suddenly so hung up on the initial lumens of the lamps? Replacing a set of Colortrans with a set of Jrs. should be a no-brainer, so why am I hesitating now?