With the dramatic increase in light output of the "new", ductile tungsten bulb brought out in 1911, fixture designs opened up. Indirect lighting, which uses light reflected off the ceiling, helped moderate shadows and offered a more gentle room illumination. An offshoot of this technology that became popular was the semi-indirect fixture which offered both reflected and diffused light . Bowls do a wonderful job of softly filling a room with warm light. Because the bulbs and sockets are well ventilated, higher wattage bulbs may be used and coupled with wall mounted dimmer switches, offer a great range of illumination levels.