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Phot to Lux Converter
Converts phot to lux instantly. One phot equals 10000 lux. Includes a reference table and the reverse conversion.
Converters
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No sign-up
Free, unlimited
Enter a value to convert.
In short
One phot equals 10000 lux. To convert phot to lux, multiply by 10000. To go the other way, multiply lux by 0.0001. So 5 phot is 50000 lux, 10 is 100000 and 100 is 1e+6. Both units measure illuminance and light level, so the conversion is a single exact multiplication with no offset — the same factor works in a spreadsheet or in code.
How to use the Phot to Lux Converter
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Phot to Lux Converter
The Phot to Lux Converter converts phot to lux instantly. One phot equals 10000 lux. Includes a reference table and the reverse conversion. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Converting a single phot figure without opening a spreadsheet.
- Checking a specification written in phot against equipment rated in lux.
- Getting the factor itself so you can reuse it in a formula.
Details
| 1 Phot | 10000 Lux |
|---|---|
| 1 Lux | 0.0001 Phot |
| Conversion type | Exact multiplication — no offset needed |
| Measures | Illuminance and light level |
The maths behind it
This tool uses lux = phot × 10000, because both units are defined against the Lux. Every intermediate value is shown on screen, so the result can be checked by hand.
Frequently asked questions
Is there a limit on how often I can use the Phot to Lux Converter?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Does anything I enter leave my computer?
No. The Phot to Lux Converter runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
How is the result calculated?
It uses lux = phot × 10000, because both units are defined against the Lux. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do I get if I try it?
Enter 10 phot and the Phot to Lux Converter returns 100000 lux.
When would I actually need the Phot to Lux Converter?
The jobs it is built for: converting a single phot figure without opening a spreadsheet. Checking a specification written in phot against equipment rated in lux. Getting the factor itself so you can reuse it in a formula. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Which values should I know?
1 Phot is 10000 Lux. 1 Lux is 0.0001 Phot. Conversion type is Exact multiplication — no offset needed. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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