Lux to Phots Converter
Quick answer: To convert lux to phots, multiply by 0.0001. For example, 10 lx is 0.001 ph. One lux equals 0.0001 ph.
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Use the Lux to Phots Converter
Lux to Phots formula and what each symbol means
ph = lx × 0.0001
| Symbol | Meaning |
|---|---|
| lx | Lux |
| ph | Phot |
Lux to Phots examples
1 lx
1 lx × 0.0001 = 0.0001 ph.
10 lx
10 lx × 0.0001 = 0.001 ph.
100 lx
100 lx × 0.0001 = 0.01 ph.
Lux compared with Phots
One ph is 10,000 times as large as one lx, so your number gets smaller when you convert lux to phots and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
About lux and phots
Lux (lx): The lux, one lumen per square metre. Phot (ph): The phot, 10,000 lx.
How to calculate Lux to Phots step by step
- Enter the value in lx (the starting unit).
- Multiply by 0.0001, because 1 lx = 0.0001 ph.
- The product is the value in ph. To go back, divide by 0.0001 or multiply by 10,000.
Popular illuminance conversions
How to read your Lux to Phots result
One foot-candle is one lumen per square foot, about 10.764 lx, and one phot is 10,000 lx.
| LUX | PHOTS |
|---|---|
| 1 | 0.0001 |
| 2 | 0.0002 |
| 5 | 0.0005 |
| 10 | 0.001 |
| 20 | 0.002 |
| 50 | 0.005 |
| 100 | 0.01 |
| 1,000 | 0.1 |
Phots to Lux: quick table
| PHOTS | LUX |
|---|---|
| 1 | 10,000 |
| 5 | 50,000 |
| 10 | 100,000 |
| 25 | 250,000 |
| 50 | 500,000 |
| 100 | 1,000,000 |
| 250 | 2,500,000 |
| 500 | 5,000,000 |
Common mistakes when calculating Lux to Phots
- Mixing klx with lx, which differ by 1,000.
- Dividing when you should multiply: from lx to ph multiply by 0.0001; from ph to lx divide by 0.0001.
Lux to Phots FAQ
How many ph are in 1 lx?
1 lx equals 0.0001 ph.
How many lx are in 1 ph?
1 ph equals 10,000 lx.
Is 1 lx = 0.0001 ph an exact conversion?
The factor is shown rounded to 7 significant figures (0.0001). The calculator above uses more digits.
What is a lux (lx)?
The lux, one lumen per square metre.
How can I estimate lux to phots in my head?
One ph is 10,000 times as large as one lx, so your number gets smaller when you convert lux to phots and bigger when you convert back. If the answer is not smaller than what you typed, you multiplied instead of dividing.
What is 3 lx in phots?
3 lx = 0.0003 ph (since 3 × 0.0001).
What is 30 lx in phots?
30 lx = 0.003 ph (since 30 × 0.0001).
What is 150 lx in phots?
150 lx = 0.015 ph (since 150 × 0.0001).
How many decimals should I keep when converting lx to ph?
Match the precision of your original measurement. For example, 0.001 ph rounds to 0.001 ph at 3 significant figures; keep more digits only for engineering or scientific work.
More in Illuminance converters
- Kilolux to Phots Converter
- Foot-candles to Kilolux Converter
- Kilolux to Lux Converter
- Foot-candles to Lux Converter
- Kilolux to Foot-candles Converter
- Foot-candles to Phots Converter
See all illuminance converters tools · All Conversion calculators · Site map
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)