Light output of U.S., European, and Japanese low-beam headlamps

The study analyzed the light output of 150 production lowbeam headlamps manufactured for use in the U.S.A., Europe, and Japan. The information is presented in tabular form by jurisdiction for the 25th-percentile, the median (50th-percentile), and the 75th-percentile luminous intensities from 20 deg. left to 20 deg. right and from 5 deg. down to 5 deg. up. The median luminous intensities by jurisdiction are also shown in a graphical form. Finally, the median luminous intensities by lamp construction are presented in a tabular form.