Epson PowerLite 685W 3500-Lumen WXGA Ultra-Short Throw 3LCD Projector - Manual (Page 153)

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Projector Setup Settings - ECO Menu
Settings on the ECO menu let you customize projector functions to save power. When you select a
power-saving setting, a leaf icon appears next to the menu item.
Setting Options Description
Power Consumption Auto
Normal
ECO
ECO2 (PowerLite 680/685W
only)
Selects the brightness mode of
the projector lamp
Auto : allows the projector to
sense the optimum lamp
brightness and adjust the lamp
brightness accordingly
Normal : sets maximum lamp
brightness
ECO : reduces lamp brightness
and fan noise, and saves power
and lamp life
ECO2 : reduces fan noise less
than ECO