Skin Types and Burn Time - UV Index 4.6     Moderate 

Type Also Called Tanning Behavior Hair and Eye Color Burn Time
I very light, or "Celtic" Often burns, rarely tans. Tends to have freckles, red, brown, or blond hair, blue, brown, green or gray eyes. 15 min
II light, or light-skinned European or "average caucasian" Usually burns, sometimes tans Tends to have light or dark hair, blue, green, hazel, brown or gray eyes. 22 min
III light intermediate, or dark-skinned European Rarely burns, usually tans. Usually has brown hair and blue, green, hazel, brown, or, rarely, black eyes. 43 min
IV dark intermediate, also "Mediterranean" or "Olive skin" Rarely burns, often tans. Tends to have dark brown hair and blue, brown, green, or black eyes. 65 min
V dark or "Brown" type Naturally black-brown skin Black hair and brown or black eyes. 87 min
VI very dark, or "Black" type Naturally black-brown skin Black hair and eyes, with minor variations. 109 min
For more information see the UV Forecast page on this site.

Skin Color Information Compliments of Wikipedia
Burn Time Formulas from Himaya Sports Sun Protection