Exposed lights
This may look cool in your favorite bar or cafe, but it should not become a part of your home. The exposed light bulbs really just look chaotic and do not actually provide any good light for the room. Without any shade of diffusion, this may actually hurt your eyes over time.
Remember, there is a reason why people in the film industry take time to study lighting and perfect it. There is an art to good lighting and we can not overlook it. Last, of all, we can not just place exposed light bulbs in a room and walk away as if the job is finished.