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Lux to Phot Converter
Converts lux to phot instantly. One lux equals 0.0001 phot. Includes a reference table and the reverse conversion.
Converters
Nothing uploaded
No sign-up
Free, unlimited
Enter a value to convert.
In short
One lux equals 0.0001 phot. To convert lux to phot, multiply by 0.0001. To go the other way, multiply phot by 10000. So 5 lux is 0.0005 phot, 10 is 0.001 and 100 is 0.01. 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 Lux to Phot 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 Lux to Phot Converter
The Lux to Phot Converter converts lux to phot instantly. One lux equals 0.0001 phot. 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 lux figure without opening a spreadsheet.
- Checking a specification written in lux against equipment rated in phot.
- Getting the factor itself so you can reuse it in a formula.
Details
| 1 Lux | 0.0001 Phot |
|---|---|
| 1 Phot | 10000 Lux |
| Conversion type | Exact multiplication — no offset needed |
| Measures | Illuminance and light level |
The maths behind it
This tool uses phot = lux × 0.0001, 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
Do I need an account to use the Lux to Phot Converter?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is the Lux to Phot Converter safe to use with private information?
No. The Lux to Phot Converter runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
Can I check the maths myself?
It uses phot = lux × 0.0001, 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.
Can you show an example?
Enter 10 lux and the Lux to Phot Converter returns 0.001 phot.
When would I actually need the Lux to Phot Converter?
In practice it gets used for three things: converting a single lux figure without opening a spreadsheet. Checking a specification written in lux against equipment rated in phot. 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.
What figures does the Lux to Phot Converter work from?
1 Lux is 0.0001 Phot. 1 Phot is 10000 Lux. 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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