601–426 /17 F70 Series20
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit,
determined at 10 cm. The HDdiffuse can be neglected if the measured light at the screen surface is below
5000 cd/m² or 15000 LUX.
1.6 HD in function of the lens Throw Ratio (TR)
TR (Throw Ratio)
The ratio of the distance to the screen (throw) to the screen width.
HD versus Throw Ratio
Image 1–4 Hazard Distance in meters versus Throw ratio of the lens for the F90 projectors
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