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5.8 Using external illumination units
If, when using a microscope in its standard version, the lighting is not suitable for the
application, then it often makes sense to fit an external lighting unit to overcome this
problem.
These lighting units are divided into two groups.
Ring lighting units
(left figure)
, usually LED
Goose neck lighting units
(right figure)
, both Halogen and LED as standard
Both units require an extra power connection and can, depending on the model, also
have an on/off switch and various lighting unit controls.
Typical ring lighting unit
Typical goose neck lighting unit
Fitting a ring lighting unit
As you can see in the figure on the left, the ring lighting units have three screws
which must be positioned such that they do not protrude into the ring. The ring will be
fitted round the objective and the screws will be screwed in until the lighting unit is
fixed firmly onto the objective.
Using goose neck lighting units
Depending on the requirements, a goose neck lighting unit is placed next to, in front
of or behind the microscope. The light source is in the housing of the unit and is
emitted through one or several optical fibre cables.
These cables are flexible and therefore offer a large number of positioning options,
so that the object being observed is perfectly illuminated.
