CREATE TABLE table_64771 ("Band" FLOAT, "Frequency  ( MHz ) " TEXT, "Wavelength" TEXT, "Type" TEXT, "Power  ( W ) " FLOAT)

What Band number has a Power (W) of 400 or less?
SELECT SUM("Band") FROM table_64771 WHERE "Power (W)" < '400'
SELECT SUM("Band") FROM "table_64771" WHERE "Power (W)" < '400'