Such circuit shown
in Fig.
The electrical relay
A relay electromagnetic switch operated solenoid. 10. looked at
the action solenoid Chapter Fig.
producing invisible ultraviolet light and some blue light.25
Fluorescent lamp circuit arrangement. The fluorescent
powder the inside the glass tube very sensitive ultraviolet rays
and converts this radiation into visible light.
A typical application for fluorescent luminaire suspended ceiling
lighting modules used many commercial buildings. 5.24
Fluorescent lamp construction.16.25. The solenoid relay
operates number switch contacts moves under the electromagnetic
Starter switch
Lamp
Choke
L
N
p.
correction
capacitor
FIGURE 10.
Definition
A relay electromagnetic switch
operated solenoid.Baisc Electrical Installation Work
216
The arc radiates much more than visible light:
almost all the visible light from fluorescent tube
comes from the phosphors
Glass, internally coated
with fluorescent phosphor,
cut away reveal cathode
Bi-pin cap
Tube filled with argon
and mercury vapour
Cathode coated with
electron emitting material
and fitted with
cathode shield
FIGURE 10.f.
Fluorescent luminaires require simple electrical circuit initiate
the ionization the gas the tube and device control the current
once the arc struck and the lamp illuminated.
