I have replaced 3 cfl bulbs in my bedroom ceiling fan with these led bulbs and am very pleased with the light it fills the room with. I tried replacing the cfl from my bedside table lamp with this led bulb and the light was not as good as the cfl. I also replaced the 2 cfl bulbs in my bathroom light fixture and find the lighting effect acceptable for my needs. This bulb works best in a downward facing lighting unit. Have not tried it with a dimmer switch. I will be replacing more ceiling fan lights in my house with these led bulbs.