[comfortablynumb]

dont look at me, i'd just run a line of BX cable up the wall across the ceiling to the light. and paint the cable. thats just me, I'm not fussy. but in the BX cable its like steel conduit, you cant dammage the cable....
if you want it in the wall... your gonna have to poke a few holes. or doorways.

 

[comfortablynumb]

the motion detector... YEAH i have one in my bathroom!!!! theres perfect no wire solution for ya.
forgot all about that in the can.... works fine. you canget screw in adapters with the sensor on it for about 10 bucks..