The words "light" and "extra light" when applied to olive oil, do not have anything to do with calories but everything to do with color and flavor. Extra-virgin olive oil is darker in color and has a robust flavor. Extra-light olive oil is usually blended with a lower quality olive oil and therefore is lighter in color and flavor.
No matter what olive oil you choose, whether extra-light or extra-virgin it will contain 120 calories and 14 g fat - 10 g of that the heart-healthy or good fats - per tablespoon.