...
d) Calibration with QP 101 V.4 Card
METHOD USED FOR HIGH TEMP LIGHTS This was a section of the calibration method used for the lights before cooling fans were installed. Color Calibration with the QP 101 V.4 Card.
Adjust Exposure (Achieving White Balance by Shutter Correction):
The aim of white balance is to correct the LED's lighting with the Red, Green and Blue sensor's sensitivity to produce neutral values for the QP101 V.4 standard. The exposure intervals we set relate to how long the camera can pick up values for each color band. Try not to keep the lights on for longer than ~ 20 sec and then keep them off for ~60 sec. As the lights warm up the RGB values change, particularly the blue value, and change most rapidly in the first minute of the lights warming up. Since the SHIL is often used after being off for a bit, we are trying to calibrate to represent the measuring conditions, as best we can. Right now we do not have a defined procedure for keeping the lights on/off during calibration and thus suggest 20 sec intervals.
...