Velleman Compact fluorescentlamps(CFL) - Manual

Compact fluorescent lamps (CFL)
A compact fluorescent lamp (CFL), also known as a compact fluorescent light or energy saving light,
is a type of fluorescent lamp. Most CFLs are designed to replace incandescent lamps and fit into most
existing light fixtures.
Compared to general service incandescent lamps giving the same amount of visible light, CFLs use
less power and have a longer rated life. Downside is they have a higher purchase price. Like all
fluorescent lamps, CFLs contain mercury, which complicates their disposal.
CFLs radiate a different light spectrum compared to incandescent lamps. New phosphor
compositions have improved the colour of the light emitted by CFLs in such a way that the best warm
white CFLs are nearly similar in colour to standard incandescent lamps.
The power output mentioned on CFLs can be compared to incandescent lamps according to the
following table:
Incandescent lamp CFL
25 W 5 W
40 W 8 W
60 W 12 W
75 W 15 W
100 W 20 W
Parts
There are two main parts in a CFL: the gas‐filled tube and the magnetic or electronic ballast. An
electrical current from the ballast flows through the gas (mercury vapour), causing it to emit
ultraviolet light. The ultraviolet light then excites a phosphor coating on the inside of the tube. This
coating emits visible light.
Standard CFLs do not respond well in dimming applications and special lamps are needed when
dimming is required.
Notes: CFLs that flicker when they start have magnetic ballasts
CFLs with electronic ballasts are more common