Dome lights and tunnel lights

If an object with a complex curved geometry must be inspected to detect specific surface features, front light illumination coming from different angles is the most appropriate choice in order to get rid of reflections that can lead to uneven illumination: Dome lights are the ideal solution for these type of applications because they are designed to provide illumination coming from virtually any direction (Fig. 23 e 24). In fact, dome lights are sometimes also referred to as cloudy day illuminators because they provide uniform light as on a cloudy day.

Another type of lighting geometry is tunnel illumination: these lights are designed to provide uniform illumination on long and thin cylindrical objects and they feature a circular aperture on top (as dome lights).