8
Turn the lamp holder 90 degrees and set the center of rotation by sliding the lamp
forward and backward, so that the center of the illumination part of the lamp is
aligned with the alignment tool.
When measuring light sources with narrow beam angles it is important to ensure
that the light is pointing straight horizontally to make certain that the centre of the
beam is scanned at the correct point as shown below.
After alignment turn the light source back pointing straight towards the optical
sensor.
Different alignment examples are shown below:
Center hight
Center hight
Center hight
Center of rotation
Light bulb
Spot light
LED chip
