The safest and the light bulbs that have the least EMF radiation are ordinary incandescent bulbs. Incandescent bulbs are designed to be compatible with 60 Hz electrical lines, meaning they will not produce dirty electricity. They are not smart bulbs, which means they won’t connect to Wi-Fi and will not cause additional presence of RF radiation in your home. Also, when you compare them to fluorescent or LED lights, they produce significantly less electric field radiation.
Even though incandescent lights have worse energy efficiency and shorter life spans compared to other options, they are the safest when it comes to radiation.