phot to lux | Exact Decimal + Formula

1 Phot = 10000 Lux

One phot equals exactly ten thousand lux. Real-world use: historic photographic and laboratory illumination specs. This page expresses those values in lux, which is used for office and studio lighting requirements; a well-lit office is around 500 lux. Type a value above for an instant answer; the exact formula and the reference table are below.

About Phot and Lux

Phot (ph)

A phot is one lumen per square centimeter, equal to 10,000 lux.

Where it's used: Historic photographic and laboratory illumination specs.

Lux (lx)

Lux is the SI unit of illuminance — one lumen per square meter.

Where it's used: Office and studio lighting requirements; a well-lit office is around 500 lux.

Illumination Converter

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Precision

Formula

lx = ph × 10000

To convert Phot to Lux, use the formula displayed above.

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Phot to Lux: Quick Reference Table

Phot	Lux (Decimal)	Fraction	Real-world equivalent
0.001 ph	10 lx	-	multiple unit increments
0.01 ph	100 lx	-	multiple unit increments
0.1 ph	1000 lx	-	multiple unit increments
0.5 ph	5000 lx	-	multiple unit increments
1 ph	10000 lx	-	multiple unit increments
2 ph	20000 lx	-	multiple unit increments
5 ph	50000 lx	-	multiple unit increments
10 ph	100000 lx	-	multiple unit increments
25 ph	250000 lx	-	multiple unit increments
50 ph	500000 lx	-	multiple unit increments
100 ph	1000000 lx	-	multiple unit increments
250 ph	2500000 lx	-	multiple unit increments
500 ph	5000000 lx	-	multiple unit increments
1000 ph	10000000 lx	-	multiple unit increments

ph to lx Formula and Examples

Direct Formula lx = ph × 10000

Inverse Formula ph = lx × 0.0001

Mental Math Shortcut

Multiply the value by roughly 10000 to calculate the equivalent amount in your head.

Common Phot to Lux Calculations

5 ph = 50000 lx
10 ph = 100000 lx
50 ph = 500000 lx
100 ph = 1000000 lx
500 ph = 5000000 lx

Precision & Practical Use

For example, 10 ph = 100000 lx — roughly multiple unit increments.

Results are computed to up to 9 decimal places. Round to the precision of your measuring instrument — for most illumination applications, 2–3 significant figures are plenty.

How to Convert Phot to Lux

How many luxes are in one phot?

One Phot (ph) equals 10000 Lux (lx). To convert phots to luxes, multiply the phot value by 10000.

How do I convert Phot to Lux?

Multiply your phot value by 10000 to get the result in Lux: lx = ph × 10000. For example, 5 ph = 50000 lx.

What is the formula for converting ph to lx?

The conversion formula is lx = ph × 10000. Use the calculator above for any value, and see the reference table below for common inputs from 0.001 to 1000.

Is there a quick mental estimate for ph to lx?