Ooops

I'm installing recessed (can) lighting in the basement.  I thought the hardest part was to figure out how far apart  to place them to create even light coverage. 

Using a electronic stud finder I located the floor joists so that I wouldn'tt be cutting a hole smack dab under a joist. As you can see from the photo that's exactly what happened. Apparently the stud finder is fooled when two woods of different densities are beside each other; the previous home owner doubled-up the original joists using 2x6 pine, the original joist was some other species.

I chose another location and made another hole. I guess I'll have to patch up the other one :-(