PAR20 or R20 - what's the difference?

There are so many letters and numbers in the lighting industry, from types of lights to types of bases (that is the way the light connects to the power source), and it seems that every set of letters and numbers refers to a different thing.  I reviewed much of this in a recent post that you can see here, but today I am just sharing an answer to a question I was recently asked: "So, what's the difference between a PAR20 light/bulb and an R20 light/bulb, anyway?" Let's take a look at the similarities and differences.

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