Lux to Phot Converter
Convert lux to phots instantly. Free, bidirectional, and fully in-browser.
About this tool
Lux to Phot Converter
Convert lux to phots instantly. Free, bidirectional, and fully in-browser.
1 lux equals 0.0001 phots — enter any lux value to convert it to phots instantly. This Lux to Phot converter is a client-side tool: it applies a single multiplication (ph = lx × 0.0001) in your browser, updates the moment you type, and works in both directions — edit either field, or press swap, to convert phots back to lux. A reference table lists common lux values already converted, and nothing you enter is sent to a server.
How to use Lux to Phot Converter
- 1
Open Lux to Phot Converter on AltFTool — it loads instantly in your browser.
- 2
Type the value you want to convert into the Lux field.
- 3
Read the equivalent in phots in the result field, and copy it if needed.
- 4
Use the decimal-places slider for more or less precision, or press swap to convert phots to lux.
Why use Lux to Phot Converter
Instant, both ways
The result updates as you type, and the swap button flips the conversion to phot → lux without reloading.
Exact Illuminance math
The conversion uses the precise factor (ph = lx × 0.0001), so the number matches a manual calculation to the decimal places you choose.
Adjustable precision
A slider sets 0–10 decimal places, and very small or very large results switch to scientific notation instead of rounding to zero.
Private and free
Everything runs locally in your browser — no upload, no account, no limit on conversions.
Common use cases
- Converting a lux measurement to phots for a spec, listing, or report.
- Checking lux↔phot figures while comparing products, datasets, or documentation.
- Learning the lux-to-phot relationship from the worked formula and the common-value table.
Frequently asked questions
How many phots are in a lux?
One lux is 0.0001 phots. Multiply the lux value by 0.0001 to convert. For example, 10 lx = 0.001 ph.
What is the formula to convert lux to phots?
ph = lx × 0.0001. This tool applies it automatically and shows a worked example: 10 lx = 0.001 ph.
Can it convert phots back to lux?
Yes. Press the swap button, or type into the phot field, and the tool converts phots to lux using the inverse of the same relationship.
Is the conversion accurate?
It uses the standard illuminance definition (ph = lx × 0.0001), not a rounded approximation, so results are exact to the number of decimal places you select.
Does this work offline and stay private?
Yes. The converter is a browser-side script with no network calls: your values are never uploaded, and once the page has loaded it keeps working without a connection.
Embed this tool on your site
Add the Lux to Phot Converter widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.
<iframe src="https://www.altftool.com/embed/widget/lux-to-phots-converter"
title="Lux to Phot Converter — free AltFTool widget"
width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/lux-to-phots-converter?utm_source=embed&utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>