I live in an a frame with exposed beams built out of 3 2x12 ( not glu lams )
21 inch o.c. . I want to install additional lighting and using raceways cut into
the bottom of the center 2x12 about 1/2" . I'd also would like to drill into the
bottom to install smaller dia led lights.
Obviously I'm worried about weakening the members, but also consider these beams
to be overbuilt.