Spring is a time when lots of homeowners are redecorating by repainting the inside of their homes. When choosing paint, look for semigloss or satin finish instead of matte paint. The sheen helps reflect more light from light fixtures, so you can use fewer lights with lower-wattage bulbs. Plus, you can use an online calculator so you don't overbuy paint. These calculators will use the dimensions of your room to tell you precisely the number of gallons and quarts you need.