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Noxes to Phots Converter (nx to ph)

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Live Conversion • ISO 8995:2002 Certified
1 Nox = 1 × 10⁻⁷ Phot
1 nx = 1 × 10⁻⁷ ph • 1 ph = 1 × 10⁷ nx
Nox to Phot: One Nox is equal to 1 × 10⁻⁷ Phots.
Certified Authority Value
0.00000010
ph
Exact: 1 ph ≡ 1 × 10⁷ nx
nx
nx
Swap to Phot to Nox
Swap to Phot to Nox
ph
ph 1 × 10⁻⁷
Quick Values:
Conversion Formula
To convert Nox to Phot, multiply by 1 × 10⁻⁷
nx × 1 × 10⁻⁷ = ph

Calculation: 1 nx × 1 × 10⁻⁷ = 1 × 10⁻⁷ ph

Common Nox to Phot Calculations

Quick-lookup reference table showing calculated equivalents for standard increments between Nox (nx) and Phot (ph).

Tap any row to calculate
Nox to Phot: Primary Direct Table (15 Steps)
Nox to Phot Conversion Reference Table
Conversion & Equivalent Value Scientific Notation
0.001 nx 1 × 10⁻¹⁰ ph 1 × 10⁻¹⁰
0.01 nx 1 × 10⁻⁹ ph 1 × 10⁻⁹
0.1 nx 1 × 10⁻⁸ ph 1 × 10⁻⁸
0.5 nx 5 × 10⁻⁸ ph 5 × 10⁻⁸
1 nx 1 × 10⁻⁷ ph 1 × 10⁻⁷
2 nx 2 × 10⁻⁷ ph 2 × 10⁻⁷
5 nx 5 × 10⁻⁷ ph 5 × 10⁻⁷
10 nx 1 × 10⁻⁶ ph 1 × 10⁻⁶
20 nx 2 × 10⁻⁶ ph 2 × 10⁻⁶
25 nx 2.5 × 10⁻⁶ ph 2.5 × 10⁻⁶
50 nx 5 × 10⁻⁶ ph 5 × 10⁻⁶
100 nx 1 × 10⁻⁵ ph 1 × 10⁻⁵
250 nx 2.5 × 10⁻⁵ ph 2.5 × 10⁻⁵
500 nx 5 × 10⁻⁵ ph 5 × 10⁻⁵
1000 nx 0.0001 ph 1 × 10⁻⁴
Phot to Nox: Reciprocal Summary
Phot to Nox Conversion Reference Table
Reciprocal & Equivalent Value Scientific Notation
1 ph 1 × 10⁷ nx 1 × 10⁷
5 ph 5 × 10⁷ nx 5 × 10⁷
10 ph 1 × 10⁸ nx 1 × 10⁸
50 ph 5 × 10⁸ nx 5 × 10⁸
100 ph 1 × 10⁹ nx 1 × 10⁹
View Complete 15-Row Phot to Nox Table

Real-World Context & Everyday Benchmarks

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To help contextualize these units in everyday life, science, and engineering, here are verified real-world reference points for Nox (nx) and Phot (ph):

Nox References:

  • Night vision optical unit: Starlight on moonless overcast night 1 nx
  • Clear starry sky ambient illumination without moon 10 nx
  • Full moon ambient illumination on clear night (0.25 lx) 250 nx

Phot References:

  • Centimeter-gram-second illumination unit equal to 10,000 lux 1 ph

Tap any benchmark above to automatically calculate its exact equivalent in Phot.

ISQ Dimension: [L⁻² J] Coherent SI Unit: lux (lx) Photometry, Radiometry, Optics & Acoustics

How to Convert Nox to Phot

Converting Nox (nx) to Phot (ph) is a core calculation in Illuminance, which measures the total luminous flux incident and received upon a unit surface area. Both units reside within the International System of Units (SI) and share an identical physical dimension vector ([L⁻² J]), separated strictly by a decimal order-of-magnitude factor (10^-7). Because this shift involves integer powers of 10, the conversion is mathematically exact and free from decimal rounding or irrational fractional loss. Exactly 1 Nox equals 1 × 10⁻⁷ Phot.

Direct Factor1 nx = 1 × 10⁻⁷ ph
Inverse Ratio1 ph = 1 × 10⁷ nx
Conversion ScalePure SI Metric Prefix Shift (10ⁿ Decimal Scaling)
First-Principles SI Derivation ProofNIST SP 811 / ISO 80000 Compliance

Mathematical Conversion Derivation via Coherent SI Base Unit

Under the International System of Quantities (ISQ), dimensional conversion between non-SI units is rigorously resolved by bridging through the coherent SI base unit (lux (lx)) without arbitrary rounding:

Vtarget=Vsource×(ksource→SIktarget→SI)V_{\text{target}} = V_{\text{source}} \times \left( \frac{k_{\text{source} \to \text{SI}}}{k_{\text{target} \to \text{SI}}} \right)
Universal Dimensional Conversion Law (ISO 80000 / NIST SP 811)
1. Source SI Bridge (ksource):1 nx = 0.001 lux (lx)
2. Target SI Bridge (ktarget):1 ph = 10000 lux (lx)
Step-by-step substitution for Nox → Phot:V(ph) = V(nx) × ( 0.001 / 10000 ) = V(nx) × 1 × 10⁻⁷
Mathematical FormulaValue in Phot = Value in Nox × 1 × 10⁻⁷Direct computational formula applied for standard conversion.
Worked Example

For an engineering input of 15 nx, applying the conversion factor yields exactly 1.5 × 10⁻⁶ ph. At larger operational scale, 5000 Nox corresponds to 0.0005 ph.

Inverse check: 1 ph = 1 × 10⁷ nx.

Understanding Nox and Phot

Nox

nx
Standard Unit

A Nox (nx) is a recognized unit for illuminance.

Applications & Practical Context

In practical illumination terms, a night vision optical unit: Starlight on moonless overcast night equals 1 nx, a clear starry sky ambient illumination without moon equals 10 nx, a full moon ambient illumination on clear night (0.25 lx) equals 250 nx.

Physical Setup

A physical magnitude of 1 nx corresponds to 0.001 lx in standard SI measurement.

Conversion to SI Unit: lux (lx)
1 nx = 0.001 lx

Phot

ph
Standard Unit

A Phot (ph) is a recognized unit for illuminance.

Applications & Practical Context

In practical illumination terms, a centimeter-gram-second illumination unit equal to 10,000 lux equals 1 ph.

Physical Setup

A physical magnitude of 1 ph corresponds to 10000 lx in standard SI measurement.

Conversion to SI Unit: lux (lx)
1 ph = 10000 lx

Domain Metrology & Engineering Applications

Governing Law & Equation

Photometric Inverse Square Law (E_v = Φ_v / A)

Measurement Instrumentation

Rigorously quantified in laboratory and field settings using cosine-corrected silicon photodiode luxmeters, multi-point illuminance grid loggers, and spectral light meters.

Primary Industry Sectors

Applied across commercial architectural lighting compliance, museum light damage prevention, greenhouse horticultural lighting, and industrial workplace safety under international metrology standard ISO 8995:2002, ISO 80000-7:2019.

Physical Orders of Magnitude & Laboratory Reference Benchmarks

Physical Phenomenon / Engineering ReferenceReference ValueConverted to Phot
Night vision optical unit: Starlight on moonless overcast night1 nx1 × 10⁻⁷ ph
Clear starry sky ambient illumination without moon10 nx1 × 10⁻⁶ ph
Full moon ambient illumination on clear night (0.25 lx)250 nx2.5 × 10⁻⁵ ph
Institutional Metrology & Standard Authority:

Formulas, conversion coefficients, and base definitions on this page strictly adhere to the ISO 8995:2002, ISO 80000-7:2019 and the BIPM SI Brochure (9th Edition). Governed by Photometric Inverse Square Law (E_v = Φ_v / A) under ISO 80000 dimensional vector [L⁻² J].

Multi-Variable Engineering Bridge Architectural Lighting & Photometric Flux

Illuminance to Total Incident Luminous Flux Bridge (Lumens • Millilumens • Kilolumens • MSCP)

Calculate total incident luminous flux Φ = E_v × A captured across work surfaces and architectural envelopes, bridging surface illuminance [L⁻² J] and total luminous flux [J] via surface area (A).

Φ = E_v × A
Vector: [lx] × [m²] → [lm]
Live Calculated Bridge Equivalent:
1 nx at Commercial Office Floor (25 m²) = 0.025 lm
Equals 25 mlm • 2.5 × 10⁻⁵ klm • 0.001989 MSCP
SI Luminous Flux
0.025
lm
Lumens
Fiber Optics
25
mlm
Millilumens
Commercial Floodlight
2.5 × 10⁻⁵
klm
Kilolumens
Lamp Rating
0.001989
MSCP
Mean Spherical Candlepower
English Standard
0.001989
cp-flux
Candlepower Flux
Stadium Array
2.5 × 10⁻⁸
Mlm
Megalumens
  1. 1. Normalize Input to SI Base Unit (lx):
    E_v = 1 nx × 0.001 = 0.001 lx
  2. 2. Apply Engineering Parameter (A):
    Selected condition: Commercial Office Floor (25 m²) at A = 25 m²
  3. 3. Execute Governing Physical Law in SI Units:
    Φ = E_v × A = (0.001 lx) × (25 m²) = 0.025 lm
  4. 4. Convert to Standard Engineering Units:
    • lm: 0.025 × 1 = 0.025 lm (Lumens) • mlm: 0.025 × 1000 = 25 mlm (Millilumens) • klm: 0.025 × 0.001 = 2.5 × 10⁻⁵ klm (Kilolumens) • MSCP: 0.025 × 0.07958 = 0.001989 MSCP (Mean Spherical Candlepower) • cp-flux: 0.025 × 0.07958 = 0.001989 cp-flux (Candlepower Flux) • Mlm: 0.025 × 1 × 10⁻⁶ = 2.5 × 10⁻⁸ Mlm (Megalumens)
Explore Illuminance Converter →
Engineering Substance / Operating Standard Parameter Value (m²) Reference State / Condition Typical Industrial & Engineering Application
Executive Desk Work Surface (1.5 m²) 1.5 1.5 m² (16 ft²) Standard office task-plane lighting footprint
Commercial Office Floor (25 m²) 25 25.0 m² (269 ft²) Standard 5m × 5m open office workstation area
School Classroom Floor (60 m²) 60 60.0 m² (646 ft²) Standard academic lecture / study room
Industrial Warehouse Bay (500 m²) 500 500.0 m² (5,380 ft²) Logistics distribution racking corridor
FIFA Competition Football Pitch (7,140 m²) 7140 7,140 m² (76,854 ft²) Stadium tournament playing pitch (105m × 68m)
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Frequently Asked Questions

There are exactly 1 × 10⁻⁷ phots (ph) in 1 nox (nx). To calculate larger amounts manually, simply multiply your total number of noxes by the conversion multiplier of 1 × 10⁻⁷.

The mathematical formula to convert noxes to phots is: [value] * 1 × 10⁻⁷ = phots. Rather than doing the math manually, you can use our high-precision online calculator to process this exact equation instantly without rounding errors.

To perform the reverse calculation from phots back to noxes, you must divide your starting value by 1 × 10⁻⁷. Our bidirectional tool automatically computes this inverse equation the moment you type into the phot input field.

1 Phot is larger than 1 Nox. Specifically, 1 Nox equals 1 × 10⁻⁷ phots, meaning 1 Phot is 1 × 10⁷ times larger than 1 Nox (a difference of 7.00 orders of magnitude). Expressing measurements in noxes requires a larger numerical value to represent the equivalent physical magnitude.

A typical night vision optical unit: Starlight on moonless overcast night measures 1 nx, which corresponds to 1 × 10⁻⁷ Phot (Phot).

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