Tom & Gisele -- $7,500 Christmas Light Spectacular

Tom Brady and Gisele Bundchen's electric bill is gonna be through the roof this Xmas -- the couple is spending $7,500 to light and decorate their L.A. mansion for the Holidays.

Sources close to the couple tell us ... G&T placed an order with A-1 Christmas Trees and Lights in L.A. on Tuesday -- purchasing two twelve-foot Christmas trees ... and a whole mess of lights for their house ... totaling approximately $7,500.

Big surprise -- we're told the lights are red, white, and blue ... Patriots style. Clark Griswold would be proud.