Luminous Energy Converter — Lumen-Seconds & Talbots

Convert luminous energy between lumen-seconds (talbots), lumen-minutes, and lumen-hours.

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How this conversion works. Luminous energy is converted through the lumen-second (talbot) with exact time factors per the BIPM SI Brochure.

How to use

  1. Choose the units to convert from and to.
  2. Enter a value — the converted result updates instantly.
  3. Click Copy to copy the result to your clipboard.

Frequently asked questions

How do I convert lumen-hour to lumen-second?

1 lumen-hour = 3600 lumen-second. Choose "Lumen-hour (lm·h)" as From and "Lumen-second (lm·s)" as To, type a value, and the result updates instantly.

What is a talbot?

The talbot is the historical name for the lumen-second — total light emitted over time, the photometric analog of the joule. The names are exact synonyms.

Where is luminous energy used?

Flash photography (a strobe emits a fixed lm·s per pulse), UV-cure dosing, and integrating light exposure over time. Continuous lighting is quoted in lumens instead.

Is my data sent to a server?

No. Conversions run entirely in your browser using fixed factors — nothing is uploaded or logged.

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