Magdelan,
It looks similar to many of the meters used in reefs, the readout portion telling you the PAR digitally. The sensor is a small cycindar with a light reception end you aim at the lights.
My bulbs are 1 mos old in the center and 3-4 months old on the outside (12k's). The problem I have had with many corals has been too much light bleaching and killing them. Need to start a process of acclimating them from the bottom of the tank up instead of just placing them where I want them.
Will take a current shot today before the football games start.