Relation between CIE Standard Erythemal Dose, UV Index and SPF


The Challenge

During a solar exposure, the probability of occurrence of a sunburn is directly related to many factors (UV Index, Phototype, Sun protection, etc.) and the consideration of the use of a Solar product is sometimes difficult to estimate.

The Solution

From the exposure time, the UV Index, the Phototype and the Sun Protection used, this tool helps you to determine the time of appearance of an erythema and the probability of reaching this erythema as a function of your exposure time.

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*Proximity to UV reflective surfaces such as water, white sand or snow can reduce times by up to a factor of 2. Poor sunscreen application can dramatically reduce times too. UV exposure in shaded areas can be up to 50% of full sun exposure.

**This risk will depent of several factors such as sunscreen application, reliability of sun protection performance, location, etc. Therefore, to reduce risk, apply sunscreen generously on all body areas, allow 20 minutes to let sunscreen become effective and reapply every two hours or after any sunscreen stress (water, sweat, sand, etc.). Babies of all skin types should avoid sun.