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It is best to apply different SPF levels depending on the intended use. Experts recommend using SPF 30 for activities primarily indoors or light outdoor pursuits, and SPF 50 or higher for prolonged outdoor activities. However, a drawback is that higher numbers can cause more severe skin irritation. Experts state that frequently reapplying a product with SPF 30 or higher is more effective than using a product with a high SPF rating.