Goose502
Chameleon Enthusiast
As I understand it, the compact fluorescents distribute the same wavelengths as a linear bulb would. The problem is that the small and narrow “cone” it puts out has a very concentrated beam of those spectrums. Early compact flourecents had abnormally high concentrations of UVC, which is harmful and more of a manufacturing defect. The newer bulbs are more safe, but still concentrate all the spectrums of UV into very narrow cones of light. These concentrated cones are irritating for many reptiles not by their visual brightness, but the narrow band of UVA, UVB, and UVC to put out.