Need a hide box. You can use a simple shoe box. Or even a 12 pack case of soda.
Do you have a way to check/regulate the temperature the bulb is creating? That looks a lot like the bulb I used as a basking spot for young monitors, which gets really warm.
cover the light or put it on the outside, i am in veterinary medicine and one of the most common things i see with snakes and lizards is heat burns. itll cost alot more money to treat a nasty burn than the time it takes to get the light out of there