Division (8) The following alternate test procedure is used to calculate maximum On Mode power consumption for displays shipped with Automatic Brightness Control enabled by default. For this test procedure, high ambient lighting is to be set at 300 lux, while low ambient lighting is to be set at 0 lux, as follows:

Set the ambient light level to 300 lux as measured at the face of an ambient light sensor.

Allow the readings on the power meter to stabilize, and then take the high ambient lighting true power reading, Ph, in watts from the power meter. Measurements are considered stable once the wattage reading does not vary more than 1 % over a three-minute period. (Refer to Product Test Setup, Section I, Stability.)

Set the ambient light level to 0 lux as measured at the face of an ambient light sensor.

Allow the readings on the power meter to stabilize, and then take the low ambient lighting true power reading, Pl, in watts from the power meter.

Calculate average On Mode power consumption using the equation in section 3.A.3., Displays with Automatic Brightness Control, on page 7 of the specification.