A long time ago, in a version of Lightroom far far away…well, ok, a previous version…there were separate controls for brightness and exposure. Since then Adobe, apparently feeling that this was too confusing for the average user, decided to roll it into a single “exposure” control. However, brightness controls still exist in other applications, and while the exposure control is probably fine 90% of the time, there are still times when you may need to use a basic “brightness” adjustment in Lightroom.