A datasheet is being worked on - these were initially developed for internal use for calibrating spheres. I will ask about the documentation of the reference source too.
In terms of Maukka lights, I’d imagine better overall - for one thing, they’re AC powered and actively cooled so the battery and thermals are entirely removed from the equation as a variable, and also higher output than most Maukka lights IIRC, so better for calibrating larger tubes/sphere.