Safety lighting challenging-coded into a plug-in fixture?

well-known bicycle storage shed in the garage: situation of ? Create a safety device wired to light in a plug-in I think lighting wired motion sensor security and the close connection of son with wire nuts and electrical tape to an extension cord that reduce the female finish and stripped son believed in an electrical outlet in my storage shed. The light is mounted outside the hangar, I use an extension to the earth. Is it okay to do this with out a junction box? Otherwise I might a single

Outdoor Storage Sheds