Stage Light Illuminance Calculator
Compute illuminance (lux) at the stage from a fixture's intensity and throw using the inverse-square law — and how it changes if you move the fixture.
Illuminance falls with the square of distance: a 100,000 cd source gives ~1,560 lux at 8 m but only ~390 lux at 16 m — a quarter of the light for double the throw. This is why fixtures fight to reach a deep stage and why exposure for camera must account for throw, not just fixture wattage.
Rule / Formula
Compute illuminance (lux) at the stage from a fixture's intensity and throw using the inverse-square law — and how it changes if you move the fixture.
About Stage Light Illuminance Calculator
Compute illuminance (lux) at the stage from a fixture's intensity and throw using the inverse-square law — and how it changes if you move the fixture. Illuminance falls with the square of distance: a 100,000 cd source gives ~1,560 lux at 8 m but only ~390 lux at 16 m — a quarter of the light for double the throw. This is why fixtures fight to reach a deep stage and why exposure for camera must account for throw, not just fixture wattage.
How to use Stage Light Illuminance Calculator
- 1Enter your values into the fields in Stage Light Illuminance Calculator.
- 2The result and any pass/fail verdict update instantly as you type — no button to press.
- 3Check the substituted formula and worked example to see exactly how the result was derived.
- 4Copy or note the result for your spec, delivery or planning.
Why use Stage Light Illuminance Calculator?
- ✓Runs entirely in your browser with instant, private results — no data leaves your device.
- ✓Built on a published reference: Inverse-square law; photometry (cd → lux).
- ✓Shows the governing formula and a worked example, so you can trust and check every result.
- ✓100% free with no sign-up, no watermark and no usage limits.
- ✓Works on any device — desktop, tablet or phone — and keeps working offline once loaded.
Frequently asked questions
What does Stage Light Illuminance Calculator do?+
Compute illuminance (lux) at the stage from a fixture's intensity and throw using the inverse-square law — and how it changes if you move the fixture. Illuminance falls with the square of distance: a 100,000 cd source gives ~1,560 lux at 8 m but only ~390 lux at 16 m — a quarter of the light for double the throw.
Is my data private?+
Yes. Stage Light Illuminance Calculator runs entirely in your browser — your inputs are never uploaded, stored or logged.
What standard or source is Stage Light Illuminance Calculator based on?+
It follows Inverse-square law; photometry (cd → lux). Always confirm against the current official document, as specifications and rates can change.
What formula does it use?+
Stage Light Illuminance Calculator uses: illuminance (lux) = intensity (cd) ÷ distance² (inverse-square law). The tool shows this formula with your own numbers substituted so you can verify the result.
Is Stage Light Illuminance Calculator free to use?+
Yes — it is completely free with no account, no sign-up and no usage limits. There is no watermark and no paywall.
Embed Stage Light Illuminance Calculator on your website
Want Stage Light Illuminance Calculatoron your own site? Paste this snippet into any HTML page — it's free, with no API key or sign-up. The tool loads in an iframe and keeps working exactly as it does here.
<iframe src="https://tooljolt.com/tools/stage-light-illuminance-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Stage Light Illuminance Calculator — ToolJolt" loading="lazy"></iframe>Related Broadcast tools
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