The overall score is comprised of the initial luminosity (20%), 3500-hour luminosity (60%) and failure score (20%).
Our test is based on the Australian Standard for self-ballasted lamps. The lamps tested are a mix of screw and bayonet fittings; generally all are "warm white". We install six samples of each model in a rig of 150 light fittings, and burn them in for at least 100 hours. The lights then are put into a continuous switching cycle of 165 minutes on, then 15 minutes off, so they're on for a total of 22 hours per day.