I have installed 10 ceiling boxes in a workshop area and intend to put simple porcelain sockets on them to provide general overall lighting. Circuit wired with 12/2 NM between boxes, circuit protected at 20A. Plan to use 150W equivalent CF bulbs so no issue with heat.

Installing the porcelain sockets I had intended to use stranded 16 THHN for pigtails on each to reduce the stress on the socket connections and actually fit the wire under the attachment screw.

Just want to confirm that this use of reduced size wire for fixture attachment is OK. (I have seen plastic sockets with crimped on 18 pigtails.)