I have printed with cold light or dichroic heads for almost twenty years. I always accepted as "gospel" the Ansel Adams "text" on the Callier effect. I recently came upon a study of the quality of light as it relates to enlarging. I have recently been led to believe that the condensor or point light sources will provide the greater degree of print sharpness if all other pararmeters in a comparison are kept intact. In other words if we compare "apples with apples". --No oranges allowed!
I had never considered the dust that the diffusion light sources were compensating for were also having a similar effect on negative detail. It seems that they do, though.
Am I about to run out and buy the latest Durst with the Azo head? Nope, don't think so.