During the day the peninsular turtle will periodically move on to the basking area. This Allows the turtle to dry off, warm up, absorb UVB and rest. A good basking spot should be around 26.5C and provide sufficient UV. All Turtles require additional UVB lighting. Yellow-bellied sliders require UVB light in order to synthesise vitamin D. Without vitamin D (in particular D3) yellow-bellied sliders are not able to metabolise calcium properly causing problems with bone growth. A spot light and UV tube can be used over the basking area of the turtle. Either a 60w or 100w basking bulb should be sufficient depending on temperatures achieved. A 12% intense UV tube (either T5 or T8) can be used to provide the intense UV. Alternatively, a single mercury vapour bulb can be used to provide both heat and UV. This bulb should be placed 30cm or closer and will need a porcelain or ceramic lamp holder.