A connector of the present invention comprises a sleeve, a latch, a stopper, a slider, a pressing projection, and a slider impelling section. A message database stores standard and customized information messages. The MPSNs are logically represented by a first binary tree in which each node of the first binary tree is associated with a domain of a directory service and one or more of the MPSNs. Heat generated by the lamps is exhausted out of the luminaire without air heated by the lamps from passing through a chamber housing ballasts of the luminaire. Quantitative assessments of PBP pigments, CDOM, and other fluorescent constituents, as well as basic structural characterizations of photosynthesizing populations, can be performed using SDC analysis of LSE spectral measurements.