BenQ TH585 User Manual - Page 40

Lamp information Getting to know the lamp hour When the projector is in operation, the duration (in hours) of lamp usage is automatically calculated by the built-in timer. The method of calculating the equivalent lamp hour is as follows: 1. Light Usage Time = (x+y+z+a) hours, if: Time used in Normal mode = x hours Time used in Economic mode = y hours Time used in SmartEco mode = z hours Time used in LampSave mode = a hours 2. Equivalent Lamp Hour = α hours α = A-X--' × χ + A-Y--' × y + A-Z--' × z + A-A--' × a , if X= lamp life spec of Normal mode Y= lamp life spec of Economic mode Z= lamp life spec of SmartEco mode A= lamp life spec of LampSave mode A' is the longest lamp life spec among X, Y, Z, A When you calculate Equivalent Light Usage hour manually, it will probably have deviation from the value shown in OSD menu since projector system calculates time used for each light mode in "Minutes" then rounds down to an integer in hours shown in OSD. For time used in each light 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. To obtain the lamp hour information: 1. Go to Advanced Menu - System Setup : Advanced > Light Settings and press OK. The Light Settings page appears. 2. Press to select Light Usage Time and press OK. The Light Usage Time information is displayed. You can also get the Light Usage Time information on the Information menu. 40 Maintenance