Enter the projector lumens and the screen gain into the calculator to determine the image brightness in lumens per square meter (lm/m²). This calculator helps you understand how bright an image will be based on the projector’s output and the reflective properties of the screen.
Screen Gain Formula
The following formula is used to calculate the image brightness on a projection screen.
IB = L * SG
Variables:
- IB is the image brightness (lm/m²)
- L is the projector lumens (lm)
- SG is the screen gain (dimensionless)
To calculate the image brightness, multiply the projector lumens by the screen gain.
What is Screen Gain?
Screen gain is a measure of how much a projection screen amplifies the light from a projector. A screen with a gain of 1.0 reflects the same amount of light as a standard whiteboard, while a screen with a higher gain reflects more light, resulting in a brighter image. Screen gain is important for determining the suitability of a screen in different lighting conditions and for various sizes of audiences.
How to Calculate Image Brightness?
The following steps outline how to calculate the Image Brightness.
- First, determine the projector lumens (L).
- Next, determine the screen gain (SG).
- Use the formula from above = IB = L * SG.
- Finally, calculate the Image Brightness (IB) in lumens per square meter (lm/m²).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
projector lumens (L) = 3000 lm
screen gain (SG) = 1.2
