Epson PowerLite L400U, User Manual, Page: 133 / 262

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• Extended : Sets brightness to 70% and extends the life expectancy of the light source (ideal for
darker environments with ambient light, such as museums and art galleries, where a reduced
maintenance cycle is desired)
• Custom : Allows you to select a custom brightness level between 70 to 100%
7. If you selected Custom , select Brightness Level from the Brightness Settings screen and use the
left and right arrow buttons to select the brightness.
8. If you selected Custom and want to maintain consistent brightness, turn on the Constant
Brightness setting.
Note: If you turn on Constant Brightness , you cannot change the Light Source Mode and
Brightness Level settings. If you turn off Constant Brightness , the Brightness Level setting
changes according to the status of the light source.
9. Press Menu or Esc to exit the menus.
Note: If you use the projector continuously for more than 24 hours, or regularly turn it off by shutting off
the power outlet, schedule periodic Light Source Calibration events from the Extended menu.
Otherwise, the Constant Brightness setting may not work properly.
Constant Brightness Usage Hours
Parent topic: Using Basic Projector Features
Constant Brightness Usage Hours
Light source life span
The estimated life span of the light source varies depending on the Brightness Level setting and
whether the Constant Brightness setting is on or off.
Constant Brightness off