suspended from the ceiling by stems or
cables; mounted on top of furniture above
eye level; or attached to walls, columns, or
the tops of floor stands. Some provide indi-
rect light only; others, usually stem-mounted,
also have a downlight component.
Uplights. Point-source indirect luminaires
often use linear sources, such as T2½, T3,
and T4 tungsten-halogen lamps; ED18, T6,
T7, and T15 metal halide lamps; and ED18
and T15 HPS lamps. Diffuse-source indirect
luminaires use compact, T5, T8, and T12
fluorescent lamps.
Fluorescent uplights (figure 12.35) were
developed primarily to provide an evenly illu-
minated ceiling similar to the recessed lumi-
nous ceiling (figure 12.18). The intent is the
same: to create an evenly illuminated ceiling
plane without variations in luminance on the
ceiling surface.
LUMINAIRESFigure 12.34Typical tungsten-halogen uplight.Figure 12.35Typical fluorescent uplight (“indirect”)
luminaire.