dc.description.abstract |
Though the history of lamps are almost as long as
that of electricity and various kinds of lamps have
been developed, those with high efficiency have
not been invented yet.
Among others, the fluorescent lamp is in the limelight
due to its relatively reasonable efficiency and,
thus, is most widely used nowadays. The fluorescent
lamps, however, require high voltages at the beginning
of the lighting instant as in the cases of the other discharge
tubes, and maintain almost constant voltages
during the lighted interval, which makes it difficult
to light the lamps with good efficiency.
Many approaches have been developed to light the
fluorescent lamps with good efficiency since the invention
of lamps. However, the conventional choke ballasts
developed in early days are still considered to be
the most popular ones nowadays in spite of their
many shortcomings for reasons of technical difficulties
and economics of other methods. |
en_US |