No. 104 - Miljøstyrelsen

18
� Light bulbs without integral ballast (straight fluorescent lamps - pin
based lamp).
Figure 2-1 shows examples of light bulbs with integral ballast and without
integral ballast. ‘Ballast’ means a device which serves mainly to limit the
current of the lamp(s) to the required value in case it is connected between
the supply and one or more discharge lamps. A ballast may also include
means for transforming the supply voltage, dimming the lamp, correcting the
effect factor and, either alone or in combination with a starting device,
providing the necessary conditions for starting the lamp(s) (EU, 2009).
Light bulbs with integral ballast have a normal base, i.e. bayonet or screw
base. This means that the consumer can replace incandescent bulbs with this
type of lamp in their normal socket directly. Light bulbs without integral
ballast (single and double-ended straight fluorescent lamps) are tubes that are
pin based. Due to this pin base they can only be used in sockets designed for
this type of lamp, i.e. they cannot directly replace incandescent lamps. Nonintegral
lamps are single-ended while straight fluorescent lamps are doubleended.
Figure 2-1. Light bulb with integral ballast (left ) and without integral ballast (right)
(General Electrics, 2009).
SKAT (Danish Tax and Customs Administration)
According to SKAT’s guidelines on excise duties 2009-2 all single-ended low
energy fluorescent lamps (compact fluorescent lamps) are exempted from
”excise duty on incandescent lamps etc. and electronic fuses” (Skat, 2009).
SKAT thus distinguishes between compact fluorescent lamps and straight
fluorescent lamps through the number of sockets:
� Compact fluorescent lamps are single-ended
� Straight fluorescent lamps are double-ended.
Straight fluorescent lamps are furthermore divided into two categories, of
which one is subject to excise duty:
� ”Straight fluorescent lamps with a power of 20 or 40 watt and
emitting ultraviolet light. The tube is coated on the inner side with a
specific fluorescent material. Lamps are designed for use in standard
sockets.”
Straight fluorescent lamps exempt from excise duty are described as:
� ”Straight fluorescent lamps with a power of 400 watt emitting
ultraviolet light. The length of the tube is 12 cm and it is equipped at
each end with a main and a secondary electrode. They contain