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Bar lights can be used to apply a strip of light along a target edge. Depending on the angle of the light and the camera, the bar light can be used to enhance or reduce specular reflection from a target. For highlighting a feature with specular reflection (such as the tip of a pin) the direct reflection of light has to come back into the camera. For removing specular reflection (sometimes referred to as hotspots) the direct line of reflection needs to be away from the camera. Here are some examples of applications for this type of light and their comparison in the following images:
With bar lights
With standard lighting
In the video below, you can see an example of this series of lights:
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