if i remember right, the ai turn on headlights at a set brightness level. Maybe it is set to high currently. There is a setting in the pure settings that shows this I believe.OK, fixed it. Worth remembering.
Weather on the DRIVE screen was set to overcast. Changing this to CLEAR stopped AI using headlights during the day, even though these 'DRIVE screen' weather options are overridden by Pure.
shrugs