Gel Transmission Output Calculator
See how much light output you lose through a color gel (and stacked gels) from each gel's transmission percentage.
Saturated gels are hungry: a deep blue at 20% transmission throws away 80% of the fixture's output, and stacking a second gel multiplies the loss. This is why deep colours need bigger fixtures — budget the light loss here before you discover the wash is too dim in tech.
Rule / Formula
See how much light output you lose through a color gel (and stacked gels) from each gel's transmission percentage.
About Gel Transmission Output Calculator
See how much light output you lose through a color gel (and stacked gels) from each gel's transmission percentage. Saturated gels are hungry: a deep blue at 20% transmission throws away 80% of the fixture's output, and stacking a second gel multiplies the loss. This is why deep colours need bigger fixtures — budget the light loss here before you discover the wash is too dim in tech.
How to use Gel Transmission Output Calculator
- 1Enter your values into the fields in Gel Transmission Output 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 Gel Transmission Output Calculator?
- ✓Runs entirely in your browser with instant, private results — no data leaves your device.
- ✓Built on a published reference: Rosco / Lee gel transmission data.
- ✓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 Gel Transmission Output Calculator do?+
See how much light output you lose through a color gel (and stacked gels) from each gel's transmission percentage. Saturated gels are hungry: a deep blue at 20% transmission throws away 80% of the fixture's output, and stacking a second gel multiplies the loss.
Is my data private?+
Yes. Gel Transmission Output Calculator runs entirely in your browser — your inputs are never uploaded, stored or logged.
What standard or source is Gel Transmission Output Calculator based on?+
It follows Rosco / Lee gel transmission data. Always confirm against the current official document, as specifications and rates can change.
What formula does it use?+
Gel Transmission Output Calculator uses: output = fixture lumens × (T₁ ÷ 100) × (T₂ ÷ 100); transmissions multiply when gels are stacked. The tool shows this formula with your own numbers substituted so you can verify the result.
Is Gel Transmission Output 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 Gel Transmission Output Calculator on your website
Want Gel Transmission Output 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/lighting-gel-transmission-calculator" width="100%" height="640" style="border:1px solid #e5e7eb;border-radius:12px;max-width:680px" title="Gel Transmission Output Calculator — ToolJolt" loading="lazy"></iframe>Related Broadcast tools
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