22 August 2006
When using fluorescent lamps to light surfaces, the color-rendering index of
the lamps determines how colors will appear. In spaces where color appearance is
important, a higher color-rendering index (CRI) will improve the appearance of colors.
Figure 2-8. Downlighting only results in spaces feeling dark and "cave-like".
Lighting surfaces improves the "feel" of the space.
Figure 2-9. Example of the same space with downlighting only (left) and then with
improved surface brightness (right).
Considerations for appropriate surface brightness:
Provide high surface reflectances for walls (60% minimum) and ceilings
Light ceilings with semi-indirect wall or pendant mounted lighting. Refer to
specific application in Chapter 6, "Interior Applications".
Light walls with wallwashers Refer to Chapter 5, "Lighting Equipment".
Direct daylight to ceiling and walls. Refer to Chapter 4, "Daylighting".
For exterior applications, light vertical surfaces that are in pedestrians'
field of view. Refer to specific application in Chapter 7, "Exterior