O que's o difference entre luminance e brightness?

Luminância é an objective, measurable quantity (cd/m²). Brightness é subjective—como bright something appears to humans. Due to o eye's logarithmic response, doubling luminance doesn't double perceived brightness. Dark-adapted eyes perceive low luminance as brighter than light-adapted eyes.

Como muitos nits é bom for a display?

Indoor use: 250-400 nits é comfortable. Outdoor/sunlight readable: 1000+ nits needed. HDR content: 1000+ nits for highlights. Professional HDR mastering: 4000-10000 nits peak. A maioria laptops são 300-500 nits; flagship phones reach 1500-2000 nits.

O que's o difference entre luminance e illuminance?

Illuminance (lux) measures light falling ON a surface. Luminância (cd/m²) measures light coming FROM a surface toward o observer. A white paper in sunlight tem high illuminance; its luminance depends on como much light it reflects toward you.

Luminância Converter

Sobre Luminância Conversão

Luminância measures o amount of light emitted ou reflected from a surface in a particular direction—essentially como "bright" a surface appears to an observer. Unlike illuminance (light falling on a surface), luminance é o que your eyes actually perceive. It accounts for ambos o intensity of light leaving o surface e o area over qual it's emitted, making it direction-dependent: o mesmo surface can têm diferente luminance quando viewed from diferente angles. Este directional nature é por que display specifications must account for viewing angle effects.

O SI unidade é candela per square meter (cd/m²), também called o nit in display indústria terminology. Luminância spans an enormous range in cotidiano experience: from 10⁻⁶ cd/m² for o dimmest visible starlight to 1.6 × 10⁹ cd/m² for o sun's surface. Human eyes adapt remarkably bem across este range, but comfortable viewing typically falls entre 50-500 cd/m². Luminância é crucial for display technology (screen brightness specifications), lighting design, roadway visibility analysis, e visual comfort assessment in work environments.

Our converter handles todos padrão luminance unidades usado in photometry, display engenharia, e architectural lighting.

Comuns Luminância Conversions

De	Para	Multiplicar Por
cd/m² (nit)	foot-lambert (fL)	0.2919
foot-lambert	cd/m²	3.426
cd/m²	stilb (sb)	0.0001
stilb	cd/m²	10,000
cd/m²	lambert (L)	0.0003183
lambert	cd/m²	3,183
cd/m²	millilambert	0.3183
cd/ft²	cd/m²	10.764

Luminância Referência de Unidades

Candela per square meter (cd/m²) – O SI unidade of luminance, representing light intensity per unidade projected area in a specific direction. Este é o fundamental unidade for todos modern display specifications, lighting calculations, e photometric medições. Typical values: office lighting creates 100-500 cd/m² on white surfaces; computer monitors operate at 200-400 cd/m²; o clear sky é sobre 8,000 cd/m².

Nit – An informal but amplamente utilizado name for cd/m², especially popular in o consumer electronics e display industries. "1000 nit display" means 1000 cd/m² peak brightness capability. O term comes from o Latin "nitere" (to shine). HDR display marketing extensively uses nits because it sounds mais consumer-friendly than o technical SI unidade. 1 nit = 1 cd/m² exatamente.

Foot-lambert (fL) – O traditional US unidade for luminance, ainda usado in cinema projection standards e alguns American lighting specifications. 1 fL ≈ 3.426 cd/m². SMPTE cinema standards specify 14-16 fL (48-55 cd/m²) for 2D projection e 3.5-6 fL for 3D. Increasingly replaced by cd/m² in modern specifications.

Stilb (sb) – O CGS unidade of luminance. 1 sb = 10,000 cd/m² = 1 cd/cm². Rarely usado hoje except in older scientific literature, as values for mais prático surfaces would be inconveniently small fractions.

Lambert (L) – A unidade assuming perfectly diffuse (Lambertian) emission ou reflection from a surface. 1 L = (1/π) cd/cm² = 3,183 cd/m². O millilambert (mL) é mais commonly encountered. Usado quando analyzing matte surfaces like painted walls ou paper onde light scatters uniformly in todos directions.

Apostilb (asb) – O métrico analog of o foot-lambert for diffuse surfaces. 1 asb = (1/π) cd/m² ≈ 0.318 cd/m². Também called o blondel in alguns European references. Usado in alguns European lighting standards.