Phots to Lux Converter
Convert phots to lux instantly. Exact factor: 1 ph = 10,000 lx.
Free toolNo signupFormula shown
Convert phots to lux
The exact conversion factor is 1 ph = 10,000 lx. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the phots value by 10,000 to get lux.
Worked example
- Take 1 ph
- multiply by 10,000
- the result is 10,000 lx
How to use it
- Enter your phots
- Read the lux result
- Check the factor line to verify by hand
Frequently asked questions
How many lux are in one phots?
Exactly 10,000 lx, by the SI/NIST definition.
How do I convert lux back to phots?
Divide by 10,000 — or use the full converter where both directions are one click.
Is this rounding or exact?
The factor is exact; only the displayed decimals are rounded.