lamberts (L) to nits (nt) conversion

1 L = 3183.099 ntnt → L
Formula
1 L = 3183.099 nt

Understanding Lamberts to Nits Conversion

The lambert (L) is a CGS luminance unit describing a Lambertian surface that emits 1 lumen per square centimetre. The nit (nt) is the everyday name for the candela per square metre, the SI luminance unit used to rate the brightness of phone screens, monitors, and televisions. Converting lamberts to nits translates historical or laboratory photometric readings into the units used across the modern display industry, where mainstream screens sit in the hundreds of nits.

Conversion Formula

1 L=3183.10 nt1\ \text{L} = 3183.10\ \text{nt}

To convert Lamberts to Nits, multiply by this factor:

nt=L×3183.099\text{nt} = \text{L} \times 3183.099

Step-by-Step Example

Convert 25 Lamberts to Nits.

nt=25×3183.099=79577.5 nt\text{nt} = 25 \times 3183.099 = 79577.5\ \text{nt}

How to Convert Lamberts to Nits

Express a lambert luminance in nits, the unit used for screen brightness, in one multiplication.

  1. Record the lambert value: note the luminance in L.
  2. Multiply by 3183.099: this factor equals 104/π10⁴/\pi and converts to nits (cd/m²).
  3. Compute: for 25 L, calculate 25×3183.09925 \times 3183.099.
  4. State the answer: the luminance is 79,577.5 nits.

lamberts to nits conversion table

lamberts (L)nits (nt)
00
13183.099
26366.198
39549.297
412732.4
515915.49
619098.59
722281.69
825464.79
928647.89
1031830.99
1547746.48
2063661.98
2579577.47
3095492.97
40127324
50159154.9
60190985.9
70222816.9
80254647.9
90286478.9
100318309.9
150477464.8
200636619.8
250795774.7
300954929.7
4001273240
5001591549
6001909859
7002228169
8002546479
9002864789
10003183099
20006366198
30009549297
400012732400
500015915490
1000031830990
2500079577470
50000159154900
100000318309900
250000795774700
5000001591549000
10000003183099000

What is the Lambert?

The lambert is a non-SI unit of luminance, describing how much light is emitted or reflected from a surface toward an observer. It is named after the Swiss-German polymath Johann Heinrich Lambert and appears mainly in older optics, photometry, and lighting literature.

Definition

The lambert is defined so that a perfectly diffusing (Lambertian) surface emitting or reflecting a total luminous flux of one lumen per square centimetre has a luminance of one lambert.

1 L=3183.10 cd/m21\ \text{L} = 3183.10\ \text{cd/m}^2

Equivalently, 1 L=1π cd/cm2=104π cd/m21\ \text{L} = \frac{1}{\pi}\ \text{cd/cm}^2 = \frac{10⁴{\pi}\ \text{cd/m}^2. The factor of π\pi enters because luminance in candela per unit area relates to the emitted lumens per unit area through the geometry of a Lambertian (cosine-law) emitter. Sub-multiples such as the millilambert (mL) and microlambert are common in practice.

Origin and History

The unit honors Johann Heinrich Lambert (1728–1777), whose 1760 work Photometria laid the mathematical foundations of photometry, including the cosine emission law of diffuse surfaces. The lambert itself was proposed in the early 20th century as photometry was being systematized, and it saw wide use before the SI candela-per-square-metre (nit) became standard.

Law and Notable Facts

The lambert is not part of the SI and is discouraged in modern metrology, but it survives in legacy instruments and texts. A key convenience of the lambert family is that a perfect diffuse reflector illuminated by one lux has a luminance of exactly 1π×10−4\tfrac{1}{\pi}\times10^{-4} lambert, tidily linking illuminance and luminance for ideal surfaces.

Real-World Examples and Conversions

  • A surface of 1 lambert equals about 3183 cd/m², roughly the brightness of a bright fluorescent lamp diffuser.
  • 1 millilambert = 3.18310 cd/m², close to comfortable indoor lighting levels.
  • The closely related foot-lambert (used for cinema screens) equals about 3.426 cd/m²; standard theater screen luminance of 14 fL corresponds to roughly 48 cd/m².
  • 1 lambert ≈ 929.03 foot-lamberts.

What is the nit?

The nit is a unit of luminance used to describe the brightness of light emitted from or reflected by a surface, most familiarly the screens of televisions, monitors, and phones. It is numerically identical to the SI unit, the candela per square metre.

Definition

One nit is exactly one candela per square metre, the luminous intensity of one candela spread over one square metre of projected surface area.

1 nt=1 cd/m21\ \text{nt} = 1\ \text{cd/m}^2

The two units are interchangeable: 1 nt=1 cd/m2=1 lm/(m2⋅sr)1\ \text{nt} = 1\ \text{cd/m}^2 = 1\ \text{lm}/(\text{m}^2 \cdot \text{sr}).

Origin and History

The name "nit" derives from the Latin nitere, meaning "to shine," and came into use in the mid-20th century as a convenient shorthand for the candela per square metre. It remains popular in the display and photometry industries.

Law and Notable Facts

The nit is not an official SI unit name but is exactly equal to the SI candela per square metre, so it carries no ambiguity. Display manufacturers routinely quote peak brightness in nits, with high-dynamic-range (HDR) televisions marketed at 1000 nits or more.

Real-World Examples and Conversions

  • Standard SDR television: about 100 nits reference white.
  • Modern OLED and LCD monitors: 250–600 nits.
  • HDR displays: peak highlights of 1000–4000 nits.
  • 1 nt=1 cd/m2=10−4 stilb≈3.14159 apostilbs1\ \text{nt} = 1\ \text{cd/m}^2 = 10⁻⁴\ \text{stilb} \approx 3.14159\ \text{apostilbs}.

Frequently Asked Questions

How many nits are in one lambert?

One lambert equals 3183.099 nits, since a nit is a candela per square metre and the conversion carries the 104/π10⁴/\pi factor.

How do I convert lamberts to nits?

Multiply the lambert value by 3183.099. For example, 10 L equals about 31,830.99 nits.

Is a nit really that bright compared to a lambert?

Yes, one lambert is a very high luminance; at 3183 nits it far exceeds a typical 300-to-600-nit laptop or phone screen.

Why is a nit the same as cd/m²?

"Nit" is simply the informal, widely used name for the SI unit candela per square metre, so the two are numerically identical.

Where would I use lamberts-to-nits in practice?

It is useful when converting older luminance data into the nit ratings that manufacturers publish for displays and HDR content.

People also convert

L to cd/m2L to sbL to asbL to fL

Complete lamberts conversion table

L
UnitResult
candelas per square metre (cd/m2)3183.099 cd/m2
nits (nt)3183.099 nt
stilbs (sb)0.3183099 sb
apostilbs (asb)10000 asb
foot-lamberts (fL)929.0304 fL

Luminance conversions