What lighting setup is best for a turtle's tank to mimic their natural habitat?

Turtles need both UVA and UVB lighting to simulate sunlight, essential for their shell and bone health. The basking area should have a heat lamp to maintain a temperature around 85-90°F. Ensure the lights are on a 12-hour cycle to mimic natural day and night, and replace UV bulbs every 6 months as their effectiveness diminishes over time.