Iluminação

Sobre Illuminance Conversão

Illuminance measures o amount of light falling on a surface—o total luminous flux per unidade area. It tells you como bem-lit a surface é, regardless of o que color it é ou como much it reflects. Este distinction é important: a black surface e white surface under o mesmo lamp têm identical illuminance, but muito diferente luminance (perceived brightness). Illuminance é o que a light meter measures e o que lighting engineers specify quando designing spaces—it's o starting point for ensuring adequate visibility e visual comfort.

O SI unidade é lux (lx), igual to one lumen per square meter. Illuminance follows o inverse square law: doubling distance from a point source reduces illuminance to one-quarter. Illuminance standards define minimum lighting levels for safety, productivity, e comfort in diferente environments—offices typically require 300-500 lux, while surgical operating rooms need 10,000-100,000 lux. Building codes, occupational health regulations, e energy codes todos reference illuminance requirements.

Our converter handles todos padrão illuminance unidades usado in lighting design, photometry, e regulatory compliance.

Comuns Illuminance Conversions

Illuminance Referência de Unidades

Lux (lx) – O SI unidade of illuminance, igual to one lumen per square meter. O worldwide padrão for lighting specifications e recommendations. Typical indoor values: home living room 50-200 lux, office workspace 300-500 lux, detailed assembly work 750-1000 lux, surgical operating table 10,000+ lux. Outdoor: overcast day ~1000 lux, direct sunlight 30,000-100,000 lux. Photography light meters read in lux ou EV (related by EV = log₂(lux/2.5)).

Foot-candle (fc) – O US customary unidade, definido as one lumen per square foot. 1 fc ≈ 10.764 lux. Remains prevalent in American lighting indústria, building codes (IESNA), e HVAC specifications. US workplace standards often specify foot-candles: general office 30-50 fc, detailed work 50-100 fc. Converting mentally: divide lux by 10 for approximate foot-candles.

Phot (ph) – O CGS unidade of illuminance. 1 phot = 10,000 lux = 1 lumen/cm². Too large for mais prático aplicações—mesmo direct sunlight é apenas sobre 10 phots. Occasionally encountered in older scientific literature e high-intensity aplicações like solar concentrators.

Nox – A unidade for muito low light levels, definido as 1 millilux (0.001 lux). Usado in astronomy, night vision research, e scotopic (rod-mediated) vision studies. Full moonlight provides sobre 250 nox; starlight sobre 0.1 nox. O threshold of human vision é aproximadamente 0.01 nox.

Meter-candle – An older term equivalent to lux (1 meter-candle = 1 lux). O name emphasizes o relationship: illuminance from 1 candela at 1 meter distance. Rarely usado in modern literature but may appear in historical documents.

Saiba Mais

Explore nossos guias detalhados sobre este tema:

• Understanding Lumens e Lux
• LED vs Traditional Lighting
• Lighting Standards e Guidelines