BenQ LW550 User Manual page 42

Time used in ECO mode = y hours
Time used in SmartEco mode = z hours
2. Equivalent Light Hour =
A'
α --- - × χ
= +
X
X= light source life spec of Normal mode
Y= light source spec of ECO mode
Z= light source spec of SmartEco mode
A' is the longest light life spec among X, Y, Z.
For time used in each light source mode shown in OSD menu:
• Time used is accumulated and rounded down to an integer in hours.
• When time used is less than 1 hour, it shows 0 hours.
When you calculate Equivalent Light Hours manually, it will probably have deviation from the value shown
in OSD menu since projector system calculates time used for each light source mode in "Minutes" then
rounds down to an integer in hours shown in OSD.
To obtain the light source hour information:
1. Go to Advanced Menu - Settings > Light Usage Time and press OK.
2. The Light Usage Time information is displayed.
You can also get the light source hour information on the Information menu.
Extending light source life
• Setting the Light Source Mode
Go to Advanced Menu - Picture > Advanced Color Settings > Light Source Mode and select a
suitable light source power from among the provided modes.
Setting the projector in ECO or SmartEco mode extends light source life.
Light mode Description
Normal Provides full light source brightness
ECO Lowers brightness to extend the light source life and decreases the fan noise
Adjusts the light source power automatically depending on the content brightness
SmartEco
level while optimizing display quality
• Setting Auto Power Off
This function allows the projector to turn off automatically if no input signal is detected after a
set period of time to prevent unnecessary waste of light source life.
To set Auto Power Off, go to Advanced Menu - Settings > Operation Settings > Power On/Off
Settings > Auto Power Off and press
42 Maintenance
α
hours
A' A'
--- - × --- - ×
+
y z
, if
Y Z
/ .