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HPS lights

I made a special trip to the electrical supply house today, with the
intention of making a metal halide lighting arrangement for my 60
gallon.  Much to my disappointment, the fixtures that I thought were MH
turned out to be high pressure sodium.  I haven't seen HPS mentioned on
this list... 

What are the problems with this sort of light?  Heat?  Efficency? Color
temp?  Any thoughts, anyone?