User Manual
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Gain
Gain is a measure of reflection performance. Gain is related to a universal
MgCO3 reflects projected light back with perfect evenness. Matte White, with a
measured gain of 1.0, is the standard brightness for a projection screen surface.
Lux
The perceived amount of light that is reflected by the projection screen is expressed in
output, the size of the projection screen and the gain characteristic of the screen
surface are all appropriately matched to each other. This is achieved when the ratio
between de LUX value of the projected image and the wall behind it is at least 5 to 1.
As a general guideline, one can say that in normal ambient light conditions, the
background light output is approximately 80 LUX meaning that the quantity of light
that comes from the projection screen needs to be about 400 LUX. In conditions of
low ambient light, the background LUX value is about 20, meaning that the LUX value
of the screen needs to be about 100.
Viewing Angle
The viewing angle of a projection screen surface indicates the maximum angle
at which the projected image is still clearly visible. The brightness of the image
decreases as the viewing angle increases in relation to the axis of the image.
The maximum viewing angle is the point at which the viewer perceives less than
50% of the luminous intensity of the image. This limit is the commonly accepted
standard for image quality.
Borders
Black borders surrounding the projection area on a projection surface increase
satisfy the highest display image quality standards, all of our projection screens
are supplied with black borders where this is technically feasible. Another benefit
of borders on a projection screen is to facilitate projector alignment.
Projector ANSI Lumen
Screen surface area in m
2
LUX = 100 low ambient light levels
LUX = 400 normal ambient light levels
LUX =
X gain
PROJECTA ACADEMY