What do PAR, BR and R stand for?
PAR stands for Parabolic Aluminized Reflector. BR stands for Bulged Reflector. R stands for Reflector.
What do the
numbers after PAR, BR and R mean?
The number indicates the diameter of the lamp in terms of 1/8th of an inch. For
example a PAR20 is 1/8 x 20 or 2.5” across. A BR30 is 1/8 x 30 or 3.75”.
There’s a common misconception that PAR bulbs are intended
for outdoor use and that R types bulbs are for indoor use. It actually all
depends on the application you are using it in and what you would like the
light appearance to look like.