Review of narrowband ultraviolet B radiation in vitiligo

Table 1 Fitzpatrick’s skin phototypes

Phototype	Sunburn and tanning history (defines the photo type)	Immediate pigment darkening	Delayed tanning	Constitutitve color(unexposed) buttock skin	UVA MED(mJ/cm2)	UVB MED (mJ/cm2)
I	Burns easily, never tans	None	None	Ivory White	20-35	15-30
II	Burns easily, tans minimally with difficulty	Weak	Minimal to weak	White	30-45	35-40
III	Burns moderately, tans moderately and uniformly	Definite	Low	White	40-55	30-50
IV	Burns minimally, tans moderately and easily	Moderate	Moderate	Beige-olive, lightly tanned	50-80	40-60
V	Rarely burns, tans profusely	Intense brown	Strong, intense brown	Moderate brown or tanned	70-100	60-90
VI	Never burns, tans profusely	Intense (dark brown)	Strong, intense brown	Dark brown or black	100	90-150

UVA: Ultraviolet A; UVB: Ultraviolet B; MED: Minimum erythema dose.