"Q: Do I still need a special UVB bulb if my chameleon's cage is next to the window so it's getting real sun?
A: Regular glass blocks over 98% of UVB rays (which is why you don't get sunburned sitting by the window) so sitting your chameleon by the window does not provide any UVB rays unless it is open and there is no glass between the sunlight and your chameleon. The heat from the sun through a window can actually be a danger to your chameleon. A UVB bulb is necessary if unfiltered sunlight cannot be provided for 5-8 hours every day.
Q: The light hood came with a plastic cover. Should I keep it on or remove it?
A: Plastic will block the majority of the UVB rays so any plastic or glass cover should be permanently removed from the light fixture before use. "