Interior Lighting for Designers

lumen output from a small package, they

are frequently used in recessed luminaires

that resemble familiar incandescent down-

lights and wall-washers. These lamps can

be dimmed with an electronic dimming bal-

last.

5. T5 twin-tube “long” rapid-start/preheat
   lamps have a four-pin in-line base with-
   out a starter; they are available from 18
   W to 80 W (figure 7.11). These are
   higher-output lamps, designed to provide
   the lumen output of conventional fluores-
   cent lamps in smaller packages. These
   lamps can be dimmed with an electronic
   dimming ballast.

6.Self-ballastedcompact fluorescent lamps

are designed to directly replace incan-

descent lamps, providing savings in

energy and maintenance. They are a

complete system, containing a double-

folded compact fluorescent lamp, an

instant-start electronic ballast, an outer

diffuser, and a medium screw base

(figure 7.12). They are available in two

kinds: modular (replaceable lamp) and

non-modular. The lamps consume one-

fourth to one-third as much energy as

their incandescent counterparts and last

up to ten times longer. These compact

fluorescents with medium screw bases

are less efficacious than other compact

INTERIOR LIGHTING FOR DESIGNERS

Figure 7.11“Long” compact fluorescent lamp at one-
quarter actual size.

Figure 7.12Non-modular, self-ballasted, compact

fluorescent lamp.