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What is the difference between SPF and UPF sun protection rating scales?

April 26, 2017difference rating scales SPF Sun upf

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What is the difference between SPF and UPF sun protection rating scales?

2 Answers

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SPF (Sun Protection Factor) is a UV sun rating which basically has some poor smoe stick his/her arm in some UV light and the time until that poor smoe gets sunburned is measured. If that guy/gal sunburns in 5 minutes and the sunscreen lotion or apparel gets him/her up to 50 minutes until he/she burns, then that lotion/apparel is SPF 10. This is a measure of UVB (think Burning rays), not UVA spectrum rays (think Aging/skin damage rays) ) N.B. your mileage will vary.

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Posted

SPF (Sun Protection Factor) is a UV sun rating for sunscreen lotions and sprays which basically has some poor smoe stick his/her arm in UV light and the time until s/he gets sunburned is measured. If that guy/gal sunburns in 5 minutes without sunscreen and, for example, ten times longer (50 minutes) with sunscreen,then that lotion is SPF 10. This is a measure of UVB (think Burning rays), not UVA spectrum rays (think Aging/skin damage rays). Sunscreen manufacturers self test their products without a standard test protocol, so your mileage will vary.