color temperature is often used to simulate
the color of standard incandescent lamps;
3000 K is compatible with tungsten-halogen
and linear, straight-tube 3000 K fluorescent
lamps; 3500 K and 4100 K are compatible
with straight-tube 3500 K and 4100 K fluo-
rescent lamps, respectively.
There are six families of compact fluo-
rescent lamps:
- T4 (½-in-diameter) twin-tube preheat
lamps have starter devices in the two-pin
plug base of the lamp. These lamps oper-
ate on inexpensive reactor ballasts and
are available from 5 W to 13 W (figure
7.8). - T4 or T5 (^58 -in-diameter)quad-tubepre-
heat lamps have two-pin plug bases and
integral starters; they are available from
13 W to 26 W (figure 7.9). Some of these
lamps use reactor ballasts; others require
autotransformer/reactor ballasts. Designed
to be a more compact, higher lumen
output variation of the twin-tube kind, they
provide a substantial increase in light
output compared to twin-tube lamps.- T4quad-tubeelectronic lamps are similar
to the quad-tube preheat lamps, except
that they have four-pin plug bases and no
integral starters; they are available from
13 W to 26 W (figure 7.9). Designed for
operation with electronic rapid-start bal-
lasts, they also operate on preheat cir-
cuits. These lamps can be dimmed with an
electronic dimming ballast. - T4 triple-tube rapid-start/preheat lamps
have four-pin plug bases without starters;
they are available from 18 W to 70 W
(figure 7.10). Designed to deliver high
DISCHARGE LAMPSFigure 7.8Twin-tube compact fluo-
rescent lamp at one-half actual
size.
Figure 7.9 Quad-tube compact
fluorescent lamp at one-half actual
size.Figure 7.10Triple-tube compact
fluorescent lamp at one-half actual
size.