Hi, I picked up a Kodak model 2 densitometer (X-rite 811) pretty cheap ($50USD). The read lamp was out. I soldered in a lamp from a Mag Lite and it works, well, it passes its self test and calibrates. The visual channel seems to work as expected, but the green channel always reads around 0.07. It also has some trouble reading very high densities over 3.07. I will have a new read lamp from X-rite tomorrow and hope it will improve the accuracy. As it is, I think it will work satisfactorily for B&W. Anyhow, my question concerning the correct operation is this. When using transmission mode, I lower the read head and the bottom opal lamp goes out. This seems to be the way it should work, since reading the calibration target verifies a good reading. Still, I would like to be sure. Can anyone verify this is the correct operation? Thank you so much!!!