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Luminous flux incident on a surface per area
In photometry, illuminance is the total luminous flux incident on a surface, per unit area. It is a measure of how much the incident light illuminates
Illuminance
SI derived unit of illuminance
The lux (symbol: lx) is the unit of illuminance, or luminous flux per unit area, in the International System of Units (SI). It is equal to one lumen per
Lux
Using sunlight for internal lighting
daylight received in an internal space can be analyzed by measuring illuminance on a grid or undertaking a daylight factor calculation. Computer programs
Daylighting_(architecture)
Comparison of a wide range of brightnesses
varies logarithmically, it is helpful to have an appreciation of both illuminance and luminance by orders of magnitude. To help compare different orders
Orders of magnitude (illuminance)
Orders_of_magnitude_(illuminance)
SI unit of luminous intensity
this area, illuminance at point r on d A , E v ( r ) = ∑ i | a ^ ⋅ ( r − r i ) | | r − r i | 3 I i . {\displaystyle {\text{illuminance at point }}\mathbf
Candela
Measure of lens speed
as an indication of the light-gathering ability of a lens, i.e. the illuminance it delivers to the film or sensor for a given subject luminance. Although
F-number
Natural light during the daytime
refracts some sunlight even when the Sun is below the horizon. Outdoor illuminance varies from 120,000 lux for direct sunlight at noon, which may cause
Daylight
Photometric measure
luminous power is concentrated into a smaller area, meaning that the illuminance is higher at the image. The light at the image plane, however, fills
Luminance
Region of color temperatures that are often viewed as pleasing to an observer
The Kruithof curve describes a region of illuminance levels and color temperatures that are often viewed as comfortable or pleasing to an observer. The
Kruithof_curve
SI derived unit of visible light emission
square metre with an illuminance of 1,000 lux. The same 1,000 lumens, spread out over ten square metres, produces a dimmer illuminance of only 100 lux. In
Lumen_(unit)
Deliberate use of light to achieve practical or aesthetic effects
lighting applications that require minimal glare and uniform general illuminance levels. Uplighting (indirect) uses a diffuse surface to reflect light
Lighting
Intensity of sunlight or solar constant
The solar constant (denoted as S☉ by the IAU standard) is a mathematical equation averaging the amount of energy received by a given area one astronomical
Solar_constant
Increasing illuminance to better accomplish a specific activity
task lighting refers to increasing illuminance to better accomplish a specific activity. However, the illuminance level is not the only factor governing
Task_lighting
Measure of illuminance for a combination of a camera's shutter speed and f-number
luminance (or illuminance). Strictly, EV is not a measure of luminance or illuminance; rather, an EV corresponds to a luminance (or illuminance) for which
Exposure_value
Light emitted by the Sun
approximately 0.935338. The solar illuminance constant (Esc), is equal to 128×103 lux. The direct normal illuminance (Edn), corrected for the attenuating
Sunlight
Current Data Density Energy / Energy density Entropy Force Frequency Illuminance Length Luminance Magnetic moment Magnetic field Mass Molarity Numbers
Orders_of_magnitude_(numbers)
Ratio of internal light level
Eo) x 100% where, Ei = illuminance due to daylight at a point on the indoors working plane, Eo = simultaneous outdoor illuminance on a horizontal plane
Daylight_factor
Topics referred to by the same term
the free dictionary. Lux (Latin, 'light') is the SI derived unit of illuminance, which measures the perceived intensity of light. Lux or LUX may also
Lux_(disambiguation)
Unit of measurement for luminance
foot-lamberts is equal to the incident illuminance in foot-candles. For real diffuse reflectors, the ratio of luminance to illuminance in these units is roughly equal
Foot-lambert
Categories of requirements for football stadiums set by UEFA
lux Eh average horizontal illuminance with uniformity ratios of U1h >0.4 and U2h >0.6 350 lux Ev average vertical illuminance on each reference plane with
UEFA_stadium_categories
Topics referred to by the same term
An obsolete synonym for the troland, a unit of conventional retinal illuminance Benjamin Luxon (1937–2024), British baritone Christopher Luxon (born
Luxon
Amount of light captured by a camera
{\displaystyle H_{\mathrm {v} }=E_{\mathrm {v} }t,} where Ev is the illuminance of the surface, measured in lux; and t is the exposure duration, measured
Exposure_(photography)
Light from the stars
spectrum, and absorption spectrum. Starlight illuminance coincides with the human eye's minimum illuminance (~0.1 mlx) while moonlight coincides with the
Starlight
Device used to measure the amount of light
slightly revised definition of illuminance, measurements with a hemispherical receptor indicate "effective scene illuminance." It is commonly stated that
Light_meter
Liquid-crystal display that transmits light
mainly as a reflective display with the contrast being constant with illuminance. However, under dim and dark ambient situations the light from a backlight
Transflective liquid-crystal display
Transflective_liquid-crystal_display
Description of the average spectral sensitivity of human visual perception of brightness
the nocturnal life of animals. Definition of melanopic illuminance and opsin-specific illuminances in the sense of Lucas (2014) are available for rodents
Luminous_efficiency_function
Building Design engineers and architects to predict luminance and/or illuminance within buildings using standardised sun and sky condition climate data
Climate based daylight modelling
Climate_based_daylight_modelling
Japanese photographer
Japan. In 2004 Kawauchi published Aila; in 2010 Murmuration, and in 2011 Illuminance. Kawauchi's art is rooted in Shinto, the ethnic religion of the people
Rinko_Kawauchi
How humans perceive color
which may vary with time and position." The wide spectrum of possible illuminances in the natural environment and the limited ability of the human eye to
Color_constancy
Design of lighting systems to meet objectives
lighting design objectives. Requirements can be quantitative (e.g., minimum illuminance) or qualitative (e.g., low discomfort glare). There are two basic types
Lighting_design
Light dependent resistor
passive component that decreases in resistance as a result of increasing illuminance (light) on its sensitive surface, in other words, it exhibits photoconductivity
Photoresistor
Instrument to measure light intensity
instrument for measuring photometric quantities such as luminous flux, illuminance, or luminance. Historically, photometry was done by estimation, comparing
Photometer
Unit of illuminance
candle; abbreviated fc, lm/ft2, or sometimes ft-c) is a non-SI unit of illuminance or light intensity. The foot-candle is defined as one lumen per square
Foot-candle
American musician
the Budapest Studio Choir, & Sterling Ensemble. In 2020, she released Illuminance, produced by Grammy Award-winning composer and pianist Peter Kater and
Sangeeta_Kaur
Sensor that detects available light levels
capable to detect ambient color. The standard international unit for the illuminance of ambient light is the lux. The typical performance of an ambient light
Ambient_light_sensor
Topics referred to by the same term
magnitude (force) Orders of magnitude (frequency) Orders of magnitude (illuminance) Orders of magnitude (length) Orders of magnitude (luminance) Orders
Orders of magnitude (disambiguation)
Orders_of_magnitude_(disambiguation)
information entropy, luminous intensity, luminance, luminous flux, illuminance, radiation. Notes: See Weight for detail of mass/weight distinction and
List_of_conversion_factors
Logarithmic measure of the brightness of an astronomical object
6th magnitude or fainter. Apparent magnitude is really a measure of illuminance, which can also be measured in photometric units such as lux. The Greek
Magnitude_(astronomy)
Surgical lamp
visible light measured by a luxmeter at a certain point. Central illuminance (Ec) Illuminance (measured in lux) at 1m distance from the light emitting surface
Surgical_lighting
Simplified light level calculation
a room. The method is a series of calculations that uses horizontal illuminance criteria to establish a uniform luminaire layout in a space. In its simplest
Lumen_method
Measurement describing the power of an illumination
radiant exitance, radiosity, luminance, luminous flux, luminous intensity, illuminance, luminous emittance). Knowledge of the SPD is crucial for optical-sensor
Spectral_power_distribution
Brightness of a celestial object observed from the Earth
spread of light pollution. Apparent magnitude is technically a measure of illuminance, which can also be measured in photometric units such as lux. The scale
Apparent_magnitude
Class of units of measurement
luminance equal to 1 cd⋅cm−2 (10 kcd⋅m−2). The phot (ph) is a unit of illuminance equal to 1 lm⋅cm−2 (10 klx). The rayl is a unit of specific acoustic
List_of_metric_units
Shape and size of a digital camera's image sensor
exposure is the integration time multiplied with the image plane illuminance, and illuminance is the luminous flux per unit area. Thus for equal exposures
Image_sensor_format
SI derived unit of luminance
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Candela_per_square_metre
Variation in brightness and the position of stars due to atmospheric refraction
cloud cover), atmospheric scintillation is defined as variations in illuminance only. In simple terms, twinkling of stars is caused by the passing of
Twinkling
Inverse relationship between the intensity and duration
emulsion. Total exposure of the film or sensor, the product of focal-plane illuminance times exposure time, is measured in lux seconds. The idea of reciprocity
Reciprocity_(photography)
Range of brightness of a display
completely dark room, e.g. in the living room (illuminance approx. 100 lx) or in an office situation (illuminance 300 lx minimum), ambient light is reflected
Display_contrast
Perception of light level
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Brightness
Measure of radiant energy over surface area
Directional quantities are denoted with suffix "Ω". Albedo Fluence Illuminance Insolation Light diffusion PI curve (photosynthesis-irradiance curve)
Irradiance
Standard RGB color space
ambient illuminance level 64 lux Encoding ambient white point x = 0.3457, y = 0.3585 (D50) Encoding viewing flare 1.0% Typical ambient illuminance level
SRGB
Scale of numbers with a fixed ratio
magnitude (force) Orders of magnitude (frequency) Orders of magnitude (illuminance) Orders of magnitude (length) Orders of magnitude (mass) Orders of magnitude
Order_of_magnitude
Perceived luminous power
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Luminous_flux
Topics referred to by the same term
Sanskrit and Persian origin word and name meaning light, radiance, bright, illuminance or bright light. Roshan is masculine name of Indian Origin and Roshni
Roshan
Color space developed by Adobe
5557 cd/m2 (0.34731% of white point luminance) Contrast Ratio 287.9 Ambient Illuminance Level 32 lx Reference Display Surround Level 32.00 cd/m2 (20% of white
Adobe_RGB_color_space
Photoflash exposure setting measurement
non-distance-related intensity of a flash arriving at a scene (a property called illuminance, measured in lux or lumens per square meter) or its duration; namely
Guide_number
Synthetic polymer
measuring heads in spectroradiometers and broadband radiometers (e.g., illuminance meters and UV radiometers) due to PTFE's capability to diffuse a transmitting
Polytetrafluoroethylene
American heavy strategic bomber
alerts the pilot to increase or reduce altitude to match the changing illuminance of the sky. The original design had tanks for a contrail-inhibiting chemical
Northrop_B-2_Spirit
Measurement of visible light
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Photometry_(optics)
Natural internal process that regulates the sleep-wake cycle
advance or delay the circadian rhythm. Both the PRC and the required illuminance vary from species to species, and lower light levels are required to
Circadian_rhythm
Illumination devices attached to bicycles
output of otherwise similar lights. The lux (lx) is this SI unit for illuminance, that is the amount of light that illuminates a surface (the road, in
Bicycle_lighting
Modern form of the metric system
Celsius °C Celsius temperature K lumen lm luminous flux cd⋅sr cd⋅sr lux lx illuminance cd⋅sr⋅m−2 lm/m2 becquerel Bq activity referred to a radionuclide s−1
International_System_of_Units
Device for measuring a physical quantity
orders of magnitude in: illuminance, luminance, and luminous flux. Photometers of various kinds: Lux meter for measuring illuminance, i.e. incident luminous
List_of_measuring_instruments
Unit of conventional retinal illuminance
Td), named after Leonard T. Troland, is a unit of conventional retinal illuminance. It is meant as a method for correcting photometric measurements of luminance
Troland
the source from their direct field of vision. Pointer lasers have an illuminance of about 1 lux, whereas during the day the pilots have to deal with sunlight
Lasers_and_aviation_safety
Portable hand-held electric light
defined as the distance at which the maximum light falling on a surface (illuminance) would fall to 0.25 lux. This is comparable to a full moon on a clear
Flashlight
Light that reaches Earth from the Moon
"supermoon") is viewed around upper culmination from the tropics, the illuminance can reach up to 0.32 lux. From Earth, the apparent magnitude of the full
Moonlight
Deprecated unit of luminance
scotopic and photopic vision of the eye. Nox (unit) to measure the dark illuminance (Dunkelbeleuchtungsstärke) Purkinje effect Photometry (optics) Scotopic
Skot_(unit)
distributes its light into space. Once this process is completed, the illuminance and luminance produced by each fixture in the space can be calculated
List of lighting design software
List_of_lighting_design_software
Human ability to adjust to changes in illumination
brightness of two different stimuli will appear reversed at different illuminance levels. For example, the bright yellow petals of flowers will appear
Chromatic_adaptation
Form of easement in English law
this. Waldram suggested that ordinary people require one foot-candle of illuminance (approximately ten lux) for reading and other work involving visual discrimination
Right_to_light
Technology of indoor and vehicular environmental comfort
Engineering Guide H: Building Control Systems Guide J: Weather, Solar and Illuminance Data Guide K: Electricity in Buildings Guide L: Sustainability Guide
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Optical illusion
point source travels in a spherical wave, decreasing in intensity (or illuminance) as the inverse square of the distance travelled. This means that a light
Forced_perspective
Extraterrestrial view of outer space
observers would notice a large decrease in available light: the solar illuminance at Pluto's average distance is about 85 lx, which is equivalent to the
Extraterrestrial_sky
Bright light which impairs vision
curtain position, not considering for artificial light. It considers illuminance and luminance from glare sources to estimate the level of dissatisfaction
Glare_(vision)
light Latin lumen, luminis, luminare dislimn, enlumine, illuminable, illuminance, illuminant, illuminate, illuminati, illumination, illumine, intraluminal
List of Greek and Latin roots in English/H–O
List_of_Greek_and_Latin_roots_in_English/H–O
Full or new moon which appears larger
surface luminance remains the same, because it is closer to the Earth the illuminance is about 30% brighter than at its farthest point, or apogee. This is
Supermoon
Structure in the midbrain which mediates responses to ambient light
neurons within the pretectal nuclei respond to varying intensities of illuminance and are primarily involved in mediating non-conscious behavioral responses
Pretectal_area
Measure of illuminance
A phot (ph) is a photometric unit of illuminance, or luminous flux through an area. It is not an SI unit but rather is associated with the older centimetre–gram–second
Phot
Accuracy of light source in showing color of objects
studies for LED office lighting: Lamp spectrum, spatial brightness and illuminance". Lighting Research & Technology. 47: 54–79. doi:10.1177/1477153513514425
Color_rendering_index
Football stadium in Wil, Switzerland
38-metre-high floodlight masts, which have a total of 126 lamps and provide an illuminance of 700 lux on the pitch. In the 2012/13 season, the stadium was renovated
Lidl_Arena
APEX. Stroebel, Compton, Current, and Zakia (2000) referred to "scene illuminance" in the text of the article, but the example used units of luminance
Light_value
Reflectance reference used in photography
technique is similar to using an incident meter, as it depends on the illuminance but not the reflectivity of the subject. (Of course taking photographs
Gray_card
intensity (candelas = lumen/steradian), luminance (candelas/m2) and illuminance (lux = lumen/m2). But as mentioned before, the human circadian system
Light effects on circadian rhythm
Light_effects_on_circadian_rhythm
Excess artificial light in an environment
lighting research for drivers and pedestrians: The basis of luminance and illuminance recommendations". Lighting Research & Technology. 50 (1): 154–186. doi:10
Light_pollution
Phenomenon caused by defective LED streetlights
compliant white-light distributions specified for roadways, even if nominal illuminance remains within acceptable bounds. Transportation agencies cited in local
2020s purpling of streetlights
2020s_purpling_of_streetlights
High-intensity electric light with a broad beam
synonym for beam angle. Luminous intensity should not be confused with illuminance, which is used to determine a different kind of beam spread defined by
Floodlight
First generation of Honda Ridgeline
rear of the bed—that is designed to provide a minimum of ten lux of illuminance throughout the bed. According to Honda, the bed's dimensions, equipment
Honda Ridgeline (first generation)
Honda_Ridgeline_(first_generation)
Age-appropriate lighting
alzheimer's disease. Older people also have reduced levels of retinal illuminance, such as having smaller pupils and less transparent crystalline lenses
Lighting_for_the_elderly
Misperception of depth due to difference in timing between eye signals
visual system's solution to a moving target when a difference in retinal illuminance, and hence a difference in signal latencies, exists between the two eyes
Pulfrich_effect
the process is over; it can also mean that spectral lines increase in illuminance as the available reactants are consumed causing a rise in certain spectral
Plasma_ashing
Phenomenon where the Sun remains below the horizon for more than 24 hours
might still be able to see their reflection, as the level of outdoor illuminance will be below that of many illuminated indoor spaces. Sufferers of seasonal
Polar_night
Hole or opening through which light travels
amount of light from the scene. In that case, the relative focal-plane illuminance, however, would depend only on the f-number N, so it is less in the camera
Aperture
Smartphone feature
mainly as a reflective display with the contrast being constant with illuminance. Typically, an ambient display solution which turns on the screen only
Always-on_display
SI unit of luminous energy
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Lumen_second
Unit of luminance
source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident
Apostilb
Curve along which a 3-D surface is at equal elevation
events occurring with coincidence such as plants flowering isophote: illuminance mobile telephony: mobile received power and cell coverage area finding
Contour_line
Multi-use stadium in Ried im Innkreis, Austria
and in the summer of 2015, the floodlights were upgraded to 1,200 lux illuminance. Since the 2016/17 season, the stadium has had the Fussl Wikinger Corner
BWT_X_Upper_Austrian_Arena
Association football stadium in Poznań, Poland
stadium were built - four 56-meter-high masts with floodlights whose total illuminance was 1890 lux. Floodlights were used for the first time in a match between
Poznań_Stadium
Class of jawless fish
larvae are underdeveloped, but are capable of discriminating changes in illuminance. Ammocoetes can grow from 3–4 inches (8–10 centimetres) to about 8 inches
Lamprey
ILLUMINANCE
ILLUMINANCE
ILLUMINANCE
ILLUMINANCE
Boy/Male
Hindu, Indian
The Biggest; Name of Lord Shiva
Girl/Female
Afghan, Arabic, Muslim
Beautiful; Pretty
Boy/Male
American, Arabic, Gujarati, Hebrew, Hindu, Indian, Kannada, Muslim, Sikh, Telugu
Strength; Fiery; Sower of Seeds; Lion; Beautiful; Brave
Girl/Female
Gujarati, Hindu, Indian
Cold; Very Cool
Girl/Female
Arabic Hebrew
or Solomon. Peace, tranquility.
Boy/Male
Muslim
All comprehensive, Complete
Boy/Male
American, British, English
From the Broad Well
Girl/Female
Arabic, Muslim
Star
Girl/Female
Muslim/Islamic
Beautiful
Male
Egyptian
, the sixth king of Egypt.
ILLUMINANCE
ILLUMINANCE
ILLUMINANCE
ILLUMINANCE
ILLUMINANCE