should higher rated electrical cords be used?

running a 400w MH and 148w of shop light flouros all on same plug on one outlet.

run off one outlet
2-12 ft 3-way 16 gauge 13a/125v/1625w into closet.
148w flouros get plug in first then another 12ft 3-way cord.
then another power strip (not known stats) runs the 400w MH

next week, add 600w HPS turns on 12 hr with 3 hours of 400w MH per 12 hrs.

on the same outlet
the other 12ft 3-way plugs into another 12ft 3-way which powers my fans.
5 fans, a carbon filter with 6" vortex fan. lots of air movement and no stinky.

no highjack just trying to get some more info out for peeps.