What's the difference between factor 30 suntan lotion and factor 4? My mum reckons it just lasts thirty times longer than factor one and nothing else but I can't see that. What do you lot think?
The factor isn't how long the lotion lasts, it's how much of the ultraviolet rays the lotion screens. As I understand it, wearing factor 30 you would need 30 hours of exposure to sunlight to receive the same amount of ultraviolet radiation you would receive in just 4 hours covered in factor 4. Does that make it any clearer? No?
