Idea of basking area and 2 lights (One UVB and the other a normal light.) needed to keep a turtle healthy.
The temperature on the basking area can be around 30 - 32 Degrees Celcius, an 'exo terra' small size clamp lamp and a 75 or 100 watt globe bulb from the supermarket is all thats needed for a normal light.
This needs to be beside the UVB light to provide warmth and help dry them out. Its also crucial to stop the turtles looking 'up' at the UV light...it can do permanent eye damage to them.
When outside, they dont stare up at the sun as its warm. A reptile light has no warmth, so they will look at it and not know they are getting harmful rays into their eyes.
NOTE: Turtle tanks should NOT have a lid as this restricts the amount of UVB Light that can get into the area and can make your turtle sick.