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Glass/Plexiglass Covers effect on Lighting output

Greetings ADPers:

With all the talk about tank covers glass, Plexiglas, no cover etc... I have
three 175w 6500K pendants and was wondering what the effect of the lens
covers are output intensity/lumens/PAR etc.  I remember reading something
maybe by Diana Walstad (sp?) where she or someone was comparing the various
outputs based on the type of aquarium tops or MH  covering/splash
guards.....Any thoughts/comments or does anyone know where I can dig up that

Tom Brennan