i don't own any viper geckos currently but have researched them in the past as i am interested in possibly owning a few at some point. supplemental lighting is not necessary for vipers as they are nocturnal geckos. for heat, flexwatt heat tape controlled by a thermostat will work best. the hot side should be about 87-90 degrees, with ambient temps around 78-80 with a slight drop at night to 74-76 degrees.