Phots to Lux Converter
Quick answer: To convert phots to lux, multiply by 10,000. For example, 10 ph is 100,000 lx. One phot equals 10,000 lx.
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Use the Phots to Lux Converter
Phots to Lux formula and what each symbol means
lx = ph × 10,000
| Symbol | Meaning |
|---|---|
| ph | Phot |
| lx | Lux |
Phots to Lux examples
1 ph
1 ph × 10,000 = 10,000 lx.
10 ph
10 ph × 10,000 = 100,000 lx.
100 ph
100 ph × 10,000 = 1,000,000 lx.
Phots compared with Lux
One ph is 10,000 times as large as one lx, so your number gets bigger when you convert phots to lux and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
About phots and lux
Phot (ph): The phot, 10,000 lx. Lux (lx): The lux, one lumen per square metre.
How to calculate Phots to Lux step by step
- Enter the value in ph (the starting unit).
- Multiply by 10,000, because 1 ph = 10,000 lx.
- The product is the value in lx. To go back, divide by 10,000 or multiply by 0.0001.
Popular illuminance conversions
How to read your Phots to Lux result
Illuminance is luminous flux falling on a surface.
| PHOTS | LUX |
|---|---|
| 1 | 10,000 |
| 2 | 20,000 |
| 5 | 50,000 |
| 10 | 100,000 |
| 20 | 200,000 |
| 50 | 500,000 |
| 100 | 1,000,000 |
| 1,000 | 10,000,000 |
Lux to Phots: quick table
| LUX | PHOTS |
|---|---|
| 1 | 0.0001 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 25 | 0.0025 |
| 50 | 0.005 |
| 100 | 0.01 |
| 250 | 0.025 |
| 500 | 0.05 |
Common mistakes when calculating Phots to Lux
- Mixing klx with lx, which differ by 1,000.
- Dividing when you should multiply: from ph to lx multiply by 10,000; from lx to ph divide by 10,000.
Phots to Lux FAQ
How many lx are in 1 ph?
1 ph equals 10,000 lx.
How many ph are in 1 lx?
1 lx equals 0.0001 ph.
Is 1 ph = 10,000 lx an exact conversion?
The factor is shown rounded to 7 significant figures (10,000). The calculator above uses more digits.
What is a phot (ph)?
The phot, 10,000 lx.
How can I estimate phots to lux in my head?
One ph is 10,000 times as large as one lx, so your number gets bigger when you convert phots to lux and smaller when you convert back. If the answer is not larger than what you typed, you divided instead of multiplying.
What is 25 ph in lux?
25 ph = 250,000 lx (since 25 × 10,000).
What is 80 ph in lux?
80 ph = 800,000 lx (since 80 × 10,000).
What is 500 ph in lux?
500 ph = 5,000,000 lx (since 500 × 10,000).
How many decimals should I keep when converting ph to lx?
Match the precision of your original measurement. For example, 100,000 lx rounds to 100,000 lx at 3 significant figures; keep more digits only for engineering or scientific work.
More in Illuminance converters
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- Lux to Foot-candles Converter
- Kilolux to Lux Converter
- Kilolux to Phots Converter
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Method, review and disclaimer
Edited by: Hemant Kumar and Anjita Rai, founders of ToolsVault (SEO and content professional, not a licensed adviser). Method: this tool runs in your browser using the formula shown on this page; the numbers you enter are not sent to our servers. Sources: NIST SP 811, Appendix B.8: conversion factors, BIPM: the International System of Units (SI)