Patent ID: 11874164
Assignee: SOLAR LIGHT COMPANY, LLC
Field: Pharmaceuticals (Chemistry)
Classification: CPC G  A | IPC A  G

Claim 8:
9. A method of measuring the protection of a sunscreen composition, the method comprising:
exposing skin to a known intensity of polychromatic light from a light source configured to produce broad band light;
measuring the amount of remitted light from the skin;
applying sunscreen to the skin;
exposing the skin to which the sunscreen has been applied to the known intensity of emitted polychromatic light;
measuring with a photodetector the amount of polychromatic light remitted from the skin to which the sunscreen has been applied; and
calculating a Protection Factor (PF) of the sunscreen by comparing the amount of light remitted from the skin with the sunscreen to the amount of light remitted from the skin without the sunscreen.