I recently replaced my UVA+UVB full spectrum bulb that failed with another brand UVA+UVB mercury vapor bulb & my baby tortoise stopped feeding & became inactive, when I first bought her home she was eating, relieving herself & active but a drastic change after UV bulb replacement. She could be in brumation since it's February but the temperatures here are 17-21 degrees celcius & I use a UV light kept on for most of the day, could the quality or brand of the bulb be a factor? Is there such thing as an inappropriate or inadequate UV bulb or lighting conditions? I read an extensive article on UV lights in this forum but unfortunately it stopped receiving comments on the topic, I took my tortoise out to the park under natural sunbeam rays it was active again & started feeding but as soon as she returned to her enclosure she reverted to the same situation as before.