Why can't the light in the studio use ordinary light bulbs? Is it feasible to change the lamp holder?

I don't know what kind of lamp you mean by lamp here. The lamps used in the shed can be divided into two categories: flash lamps and ever-burning lamps. There is also a modeling lamp in the flash, some of which are frosted incandescent bulbs, but the shape is strip (a bit like hot dog sausage). But I sometimes use ordinary incandescent bulbs or even energy-saving lamps instead. Of course, there will be some problems, but it will not affect the actual shooting. I have my own studio and know a lot about its facilities. It's just that your question is not very clear. If you can explain your question in detail, I think I can give you an accurate answer. Welcome questions.