Iimpawu zemveliso
（1）Iimpawu zokulinganisa ezingaphezulu kwama-30
（2）Vavanya ukuba umbala ukhanya kakhulu na, kwaye unike imithombo yokukhanya ephantse ibe ngama-40
（3）Iqulethe imo yokulinganisa ye-SCI
（4）Iqulethe i-UV yokulinganisa umbala okhanyayo
