Ambient light and light output of the projector
From the Projecta website:
” The clarity the image should possess in order for it to be perceived well (quantity of light which comes from the projection screen) depends on the quantity of ambient light present, the reflection value of the screen fabric and the light output of the projector. For an optimum, legible projection quality, the light output of the projector, the size of the projection screen and the reflection value of the screen fabric should be attuned to one another.The following rule of thumb applies in calculating this:
Output ANSI-Lumen projector
LUX = ———————————— X reflection value (=gain)
Surface area of screen in m.
LUX = 100 too little ambient light
LUX = 400 normal ambient light
The perceived amount of light that is reflected by the projection screen is expressed in LUX. For an optimal image quality, the ratio between the LUX value of the projected image and the wall behind it should be a minimum of 5:1. A rule of thumb which may be used is that with normal ambient light, when the light output of the background is approximately 80 LUX, the value of the amount of light (LUX) that is emitted by the projection screen should be roughly 400 LUX. If the amount of ambient light is too low, the LUX value of the background is approximately 20 which means that the LUX value of the screen should be around 100.”
Tags: projecta, projection, screen, lux, ansi, lumens, fabric, ambient, light
