Simulator Brightness Comparison
See how the same projector light output compares across different image sizes, so you understand the tradeoff between a bigger screen and a dimmer image.
| Scenario | Image width | Image height |
|---|---|---|
Brightest scenario
100" diagonal (16:9)
Why bigger is not free
A projector emits a fixed amount of light, measured in lumens. When that light is spread across a larger image area, each square unit of the image receives proportionally less light. This tool calculates a simple nominal illuminance figure, your entered lumens divided by image area, for each scenario you enter, so you can see this tradeoff directly instead of assuming a bigger screen is always a straightforward upgrade.
A comparison, not a calibrated measurement
This number is deliberately called a nominal, relative comparison rather than a real brightness measurement in lux or nits. Actual perceived brightness depends on screen gain (how much a specific screen material reflects versus a theoretical perfect diffuser), room surface reflectivity, ambient light, and the specific optics of your projector, none of which this tool has access to or attempts to estimate. What it can do reliably is show you that, say, doubling your image area with the same projector halves your nominal brightness, which is a useful planning signal even without a calibrated absolute number.
Comparing scenarios instead of chasing a threshold
Retail and enthusiast sources sometimes cite specific lumens-per-square-foot thresholds as if they were universal facts. This site avoids presenting any such threshold as settled, because the right brightness for a comfortable simulator image depends heavily on your specific room's ambient light and your screen material's gain. Instead, this tool ranks your own entered scenarios against each other by percentage, so you can see which of your actual candidate screen sizes preserves more of your projector's usable brightness.
What still matters beyond this number
Contrast, black level, and color accuracy affect how a projected image looks as much as raw brightness does, and none of them are modeled here. A dimmer image on a high-gain, high-contrast screen in a dark room can look better than a nominally brighter image on a low-gain screen in an ambient-lit space. Use this comparison alongside the screen planner and projector throw planner as one input among several, not a final verdict on your setup.
Frequently asked questions
Does a bigger simulator screen always look worse?
Not always, but it does get less light per square unit for the same projector — a projector emits a fixed amount of light, so spreading it across a larger image area proportionally dims each part of the image. Doubling image area with the same projector roughly halves nominal brightness.
Is this tool's brightness number measured in real lux or nits?
No. It is a nominal, relative comparison (lumens divided by image area), not a calibrated measurement. Real perceived brightness also depends on screen gain, room reflectivity, and ambient light, none of which this tool has access to.
Is there a universal lumens-per-square-foot threshold I should aim for?
This tool deliberately avoids presenting one as settled, because the right brightness depends heavily on your room's ambient light and screen material. Instead, it ranks your own candidate screen sizes against each other by percentage.