What's the difference between a radome and a bare lamp? Is it the difference in light quality? I mean portrait photography.

This is still different. Radome belongs to medium hard light, and bare light is hard light. The light emitted by the radome is softer and the range of light irradiation is wider. The shadow on the shadow surface of the subject is much brighter than hard light, which can form a good three-dimensional sense and texture of the subject. The radome is uniform in the process of light attenuation, which can form a good transition between light and shadow on people and the skin contrast is moderate. Because the radome can also form a good human eye and avoid high light and white death. Finally, personally, I think this model is more practical and can realize their texture well. The skin of domestic models rarely has that kind of texture.