lighting quality goes in this order IMO
NO<- normal output. some soft coral but really only good for fish only tanks
HO<-- High output. most soft corals
pc<-- power compact most soft corals some lps. no sps or clams
VHO<-- Very high output. most corals otehr then some sps and clams IMO
T5<-- just about any coral you want depending on the wattage, reflector, and ballast
MH<-- metal halide. any coral you want as well as clams
all of this is subject to how many watts you use but for standard applications the above applys