I had assumed that both lights were on during focusing/exposure measurement, but the colour was definitely on the green side - from memory, it was about grade 1. (Personally, I would call the colour yellow-green, rather than green.)

I'm surprised that you find the green light dim because, to the eye, it's far, far brighter than the blue light. The relative green/blue brightness is very obvious with the the Analyser Pro 500 because, during exposure, the lamps are turned on sequentially - so, while the image might be quite bright during the green exposure, it's almost invisible during the blue exposure.