Phots (ph)	Lux (lx)
1 ph	10000 lx
2 ph	20000 lx
5 ph	50000 lx
10 ph	100000 lx
25 ph	250000 lx
50 ph	500000 lx
100 ph	1000000 lx
250 ph	2500000 lx
500 ph	5000000 lx
1000 ph	10000000 lx

Convert Phots to Lux

Convert phots to lux (ph to lx) with our instant calculator. 1 ph = 10000 lx. Includes exact formula and reference tables.

How to Convert Phots to Lux (ph to lx)

1 Phot (ph) is equal to 10000 Lux (lx). Multiply the phot value by 10000

Quick Answer 1 ph = 10000 lx

Formula lx = ph × 10000

Inverse Factor 1 lx = 0.0001 ph

Unit Definitions & Metrology Context

The SI unit of illuminance is the lux (lx), which equals one lumen per square meter (1 lx = 1 lm/m²). It quantifies the intensity of light falling on a given surface.

About Phots (ph): Phot (ph) is a unit in the Illuminance measurement category. It is widely used in cgs optical standard (10,000 lux / 1 lm/cm²). Relative to the illuminance base unit, 1 ph equals 10000 Lux (lx).

About Lux (lx): Lux (lx) is a unit in the Illuminance measurement category. It is widely used in si standard illuminance (1 lumen/m²). The lux (lx) serves as the primary reference base unit for the illuminance domain.

Need to convert in the opposite direction? Visit our Convert Lux to Phots (lx to ph) calculator (1 lx = 0.0001 ph).

Step-by-Step Worked Examples (ph to lx)

Convert 5 Phots to Lux: Applying the formula (lx = ph × 10000): starting with 5 ph, multiply the phot value by 10000 to get 50000 lx.
Convert 10 Phots to Lux: Applying the formula (lx = ph × 10000): starting with 10 ph, multiply the phot value by 10000 to get 100000 lx.
Convert 50 Phots to Lux: Applying the formula (lx = ph × 10000): starting with 50 ph, multiply the phot value by 10000 to get 500000 lx.

Popular Illuminance Conversions

Lux ⇄ Foot-candle

Multiply lux by ~0.092903 to calculate illuminance in foot-candles (or divide lux by 10.7639).

Foot-candle ⇄ Lux

Multiply foot-candles by ~10.7639 to convert to lux (1 fc ≈ 10.764 lx).

Kilolux ⇄ Lux

1 kilolux equals exactly 1,000 lux (typical overcast daylight is 1–10 klx).

Phot ⇄ Lux

1 phot equals exactly 10,000 lux (1 lumen per square centimeter).

Frequently Asked Questions

Verified answers and formulas for converting phots to lux.

How many lux are in 1 phot?

There are 10000 lux (lx) in 1 phot (ph). Conversely, 1 lux equals 0.0001 phots.

How do you convert phots to lux?

To convert phots (ph) to lux (lx), use the formula: lx = ph × 10000. Multiply the phot value by 10000. For example, 10 ph equals 100000 lx.

How do I convert back from lux to phots?

To convert in the reverse direction from lux (lx) to phots (ph), use the inverse formula: ph = lx / 10000. Divide the lux value by 10000 (1 lx = 0.0001 ph).

What is the difference between phot (ph) and lux (lx)?

Both phot and lux measure illuminance. Phot (ph) is a unit in the Illuminance measurement category. It is widely used in cgs optical standard (10,000 lux / 1 lm/cm²). Relative to the illuminance base unit, 1 ph equals 10000 Lux (lx). Lux (lx) is a unit in the Illuminance measurement category. It is widely used in si standard illuminance (1 lumen/m²). The lux (lx) serves as the primary reference base unit for the illuminance domain.

How do you convert foot-candles (fc) to lux (lx)?

Multiply the foot-candle value by 10.7639. For example, standard office lighting of 50 fc equals approximately 538.2 lux (50 × 10.7639 ≈ 538 lx).