446 



ALTERNATING CURRENTS 



should distribute the light in a manner similar to that indicated in 

 Fig. 401 so that the walls will receive some of the light. If a 

 large room is to be illuminated, a single center light may be 

 insufficient. Such a room should be divided approximately 



(a) Spacing of lamps in 

 large room 



(6) Reflector distribution in large room 

 FIG. 402. Distribution of lighting units and lamps in large room. 



in squares, as shown in Fig. 402 (a), and a light placed at the 

 center of each square. Under these conditions, the reflector 

 should distribute the light in the manner indicated in Fig. 402 (6) . 

 This secures a more uniform lighting of the room. 



FIG. 403. Reflection and illumination from an indirect lighting source. 



Indirect lighting is used to a considerable extent. An opaque 

 inverted bowl is suspended from the ceiling, as shown in Fig. 

 403. The light is first directed to the ceiling and is then diffused 



