In general, the "daytime" lights (that is, the basking and UVB lights) should only be kept on for 10 – 12 hours a day.. An aquarium light timer to turn the lights in your turtle habitat on and off is a good investment for your turtle's world.
At night, when sleeping, extra heat and light are not necessary as long as the temperature remains around 65 o – 70 o F (18 o -24 o C). You must provide your Red-eared Slider with a "night time".
That doesn't mean you should keep a light on for him all night, but it should be on for. Yellow-bellied slider turtles spend a good deal of time in basking spots, which. You can also use incandescent bulbs to provide complementary lighting.