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You get an SPF of 18 from a 30 SPF sunscreen. A wide variance was observed in the effectiveness of the sunscreens against UV rays. According to the Food and Drug Administration, 370 nm is the minimum critical wavelength a sunscreen should have in order to be a broad spectrum sunscreen. An ideal product provides you protection against both the UVA and UVB rays and provides the least protection of 15 SPF. If you will be swimming or sweating you should select a waterproof brand. For your face you should only those products which are specially formulated for the facial skin and don’t sting. In case you are sensitive to PABA (para – aminobenzoic acid) ingredient, choose PABA – less product. For acne prone and oily skin, water – based sunscreen should be used. Also if a product is expensive, it doesn’t necessarily have to be better than the cheaper ones.
However some sunscreen is better than no sunscreen.