The LG B9 has good peak brightness with SDR content and is suitable for a fairly bright room. Its brightness is in the same ballpark as the LG E9 and is a little brighter than last year's LG B8. Its Automatic Brightness Limiter (ABL) is aggressive, similar to the E9, and it dims the screen significantly when larger areas of the screen get bright.

This TV, just like the C9 and the E9, has a new Peak Brightness setting that adjusts how the ABL performs. If you set it to 'Off', most scenes are displayed at around 266 cd/m² and there is no real variation in brightness according to the scene content, which is great. Increasing this setting to 'Low', 'Med', or 'High' increases the peak brightness of small highlights.

We took our measurements after calibration in the 'Expert (Dark Room)' Picture Mode, with Gamma set to '2.2', Color Temperature set to 'Warm2', Peak Brightness set to 'High', and OLED Light set to '100'. These were also the settings that gave us the brightest image.