Lens Brightness; Projector Configuration - Barco SIM 5W User Manual

4.7

Lens brightness

About lens brightness
While changing the projection lens, or the zoom ratio of a single projection lens, the light output on the screen decreases. The table
below gives an overview of the brightness to be expected compared to the brightest lens in our gamma (= CLD 1.6–2.4 lens in WA
position). For other lenses or zoom ratios, the table below gives an idea of the percentage of light remaining. Scheimpflug lenses
have the same light output as the normal projection lenses.
Lens
CLD 1.2-1.6:1
CLD 1.6-2.4:1
CLD 2.4-4.3:1
QCLD 0.85:1
QCLD 1.1-1.3:1
Table 4-4
Brightness obtained with different projection lenses
4.8 Projector configuration
The different configurations
Depending on the installation the projector can be mounted in different ways, the 4 different configurations are:
1. Rear/Ceiling
2. Rear/Table
3. Front/Ceiling
4. Front/Table
1
3
Image 4-10
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WA
87%
100%
90%
82%
79%
The evaluated values in the above table were obtained using on-axis position and are based on center lumens.
ANSI lumen and off-axis position values are upto 10% lower.
TP
68%
80%
75%
82%
83%
2
4
4. Installation
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