Hello and welcome! Glad to see you're trying to make Willow's home as happy and healthy as possible. The short answer is: follow this tutorial. Those instructions are a time-tested way of achieving proper conditions in your tank.
The long answer: the most popular option for a tank seems to be a UTH for the hot spot/basking area (90 deg), and a heat lamp to maintain overall ambient temperatures (80 deg.). Your BP doesn't really need a day/light night - just the proper heat and humidity! What size UTH are you using and how is it regulated? You may need to increase your UTH size and get a thermostat in order to make your hot spot warmer.
PS. Are you monitoring your humidity levels as well?
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