Phots (ph)	Nox (nox)
1 ph	10000000 nox
2 ph	20000000 nox
5 ph	50000000 nox
10 ph	100000000 nox
25 ph	250000000 nox
50 ph	500000000 nox
100 ph	1000000000 nox
250 ph	2500000000 nox
500 ph	5000000000 nox
1000 ph	10000000000 nox

Convert Phots to Nox

Convert phots to nox (ph to nox) with our instant calculator. 1 ph = 10000000 nox. Includes exact formula and reference tables.

How to Convert Phots to Nox (ph to nox)

1 Phot (ph) is equal to 10000000 Nox (nox). Multiply the phot value by 10000000

Quick Answer 1 ph = 10000000 nox

Formula nox = ph × 10000000

Inverse Factor 1 nox = 0 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 Nox (nox): Nox (nox) is a unit in the Illuminance measurement category. It is widely used in night vision & astronomy optics (1 millilux). Relative to the illuminance base unit, 1 nox equals 0.001 Lux (lx).

Need to convert in the opposite direction? Visit our Convert Nox to Phots (nox to ph) calculator (1 nox = 0 ph).

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

Convert 5 Phots to Nox: Applying the formula (nox = ph × 10000000): starting with 5 ph, multiply the phot value by 10000000 to get 50000000 nox.
Convert 10 Phots to Nox: Applying the formula (nox = ph × 10000000): starting with 10 ph, multiply the phot value by 10000000 to get 100000000 nox.
Convert 50 Phots to Nox: Applying the formula (nox = ph × 10000000): starting with 50 ph, multiply the phot value by 10000000 to get 500000000 nox.

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 nox.

How many nox are in 1 phot?

There are 10000000 nox (nox) in 1 phot (ph). Conversely, 1 nox equals 0 phots.

How do you convert phots to nox?

To convert phots (ph) to nox (nox), use the formula: nox = ph × 10000000. Multiply the phot value by 10000000. For example, 10 ph equals 100000000 nox.

How do I convert back from nox to phots?

To convert in the reverse direction from nox (nox) to phots (ph), use the inverse formula: ph = nox / 10000000. Divide the nox value by 10000000 (1 nox = 0 ph).

What is the difference between phot (ph) and nox (nox)?

Both phot and nox 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). Nox (nox) is a unit in the Illuminance measurement category. It is widely used in night vision & astronomy optics (1 millilux). Relative to the illuminance base unit, 1 nox equals 0.001 Lux (lx).

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).