How much vitamin D does Solius stimulate compared to the sun?

Solius delivers up to 12x more vitamin-D–stimulating UVB light per minute of exposure compared to afternoon sunlight at midlatitude, while avoiding the excess UVA radiation that increases risk of skin damage. For a vitamin D effective dose of 60 mJ/cm2, Solius Pro takes an average treatment time of 5 minutes compared to the sun which takes 60 minutes to deliver the same effective dose.