Par size

its measured in how many 8ths of an inch across the lense is, therefore a PAR 64 has a diameter of 8 inches.

d=(par#) * (.125)
 
You can also spec the size of the lamp to some degree in the larger units, and the type of focus, from (and I forgot the exact specs, but they're out there) very narrow to wide, or something.
 

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