Lighting
If you ride your bicycle in road traffic, it must be equipped with a
correctly functioning lighting system. The lighting system of the bicycle
usually operates correctly. In the following, we will present the settings
that will allow you to correct eventual malfunctions by yourself.
The voltage required to light the bicycle is generated by the dynamo,
from which one cable runs to front and one to the rear lamp of the
bicycle. Electric current is conducted to the rear light partly through
the metal parts of the bicycle. Current reaches the rear light via the
mounting screw of the dynamo, then the frame (or, in some cases, the
fender), and finally, through the screws that secure the light. Current
may also be conducted back to the dynamo from the light. The best
solution for this is use of a double cable.
Dynamos are the classic current generators. The most widespread
solution is a dynamo that makes contact with the sidewall of the tire
(Figure 34/1). These dynamos are lightweight and easy to attach. For
their correct operation, the head of the dynamo must fit precisely to
the sidewall of the tire.
Figure 33/1
Figure 33/2
Figure 33/3
Figure 33/4
Figure 34/1
Figure 34/2
Compared to traditional dynamos, dynamos integrated into the hub of
the front wheel represent a major technological innovation (Figure 34/2).
These dynamos are resistant to adverse weather, practically wear-proof,
and highly efficient.
The brightness of the front light can be increased significantly by using a
halogen bulb.
On rear lights, the use of diodes is becoming increasingly common
(Figure 33/1). The main advantages of diodes over traditional bulbs are
their longer service life and lower electricity consumption. Part of the
current generated by a dynamo feeds a capacitor, which provides the
power supply of the diodes when the bicycle is at rest.
The availability of white diodes makes use of the automatic position
signalling function possible on the front light (Figure 33/3).
A new comfort function is available for constantly running hub dynamos.
A darkness sensor integrated onto the lamp automatically ensures that
the lights operate when it gets dark.
The lighting system can also be set to remain permanently switched on
(in case of fog, for example), or off.
Battery-powered lighting systems are also gaining popularity. Please
observe your country's applicable regulations.
Light reflectors also form part of the lighting system.
You will find details on the light reflectors that must be fitted onto the
bicycle in the chapter on “Legislative provisions relating to bicycle
lighting”.
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