Author: Phr. Lim
SPF, the higher the better? This is a common misunderstanding among the consumers. SPF doesn’t actually reflect the strength and efficacy of a sunscreen product.
What does SPF mean?
SPF stands for Sun Protection Factor. It indicates the level of UVB (UV light that causes sunburn and red spot) protection that a sunscreen offers. Higher SPF means a longer duration of protection it offers, but not the strength and efficacy of a product. To help you understand it better, if you were to get sunburn after 15 minutes of sun exposure without putting on any sunscreen, a SPF 20 sunscreen with offer you a duration of protection of 20X15= 300 minutes. A SPF 30 sunscreen will offer you protection with a duration of 30X15= 450 minutes.
What about “PA+”?
SPF indicates the level of UVB protection, whereas “PA” measures the level of UVA protection (UVA causes skin tanning). “PA+” indicates that it can delay the duration of skin tanning for 2 to 4 times, compare to without using a sunscreen. “PA++” indicates that the tanning process can be delayed for 4-8 times, where as “PA+++” means it can delay the process for 8 times.
What’s the best sunscreen product for me then?
There is no best product, but only the most suitable one! Dermatologists suggest the use of a sunscreen with SPF of 15-25 with “PA++” will be enough to meet the requirement of daily use. For extended outdoor activity, a sunscreen with SPF of 30-50, ideally with water-resistant function is recommended. Experts also recommend to re-apply sunscreen every 2 hours, and to re-apply it each time after excessive sweating or water sports.
In conclusion, not only to use a sunscreen product with adequate SPF, but frequent application (every 2 hours) of sunscreen will be the more effective way to protect your skin from UV radiation.