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Technical Support

 PS

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3213

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013-14935B

The following graphic of precise metrics for lighting has 

images showing Luminous Flux, Luminous Intensity, Illu

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minance, and Luminance.

Luminous Flux is the quantity of the energy of the light 

emitted per second in all directions. In photometry, Lumi

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nous Intensity is a measure of the wavelength-weighted 

power emitted by a light source in a particular direction 

per unit solid angle, based on the luminosity function, a 

standardized model of the sensitivity of the human eye. 

Illuminance is the amount of luminous flux per unit area. 

The luminosity function (or luminous efficiency function) 

describes the average spectral sensitivity of human 

visual perception of brightness. It is based on subjective 

judgments of which of a pair of different-colored lights is 

brighter, to describe relative sensitivity to light of differ

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ent wavelengths. 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 the 

surface, wavelength-weighted by the luminosity function 

to correlate with human brightness perception. Lumi

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nance is the intensity of light emitted from a surface per 

unit area in a given direction.

UVA: Ultraviolet A is ultraviolet radiation with wave

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lengths between 315 and 400 nm.

UVB: Ultraviolet B is ultraviolet radiation with wave

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lengths between 290 and 320 nm, comprising less than 

1 per cent of the ultraviolet radiation that reaches the 

earth. 

UV Index: The UV index is effectively a rough measure 

of the amount of harmful ultraviolet radiation in the sun

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light reaching the Earth's surface at a given location. The 

index is a scale used to estimate the risk for sunburn in 

midday sunlight, with a low number meaning less risk 

than a high number.

PAR: (Photosynthetically Active Radiation) This desig

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nates the spectral range (wave band) of solar radiation 

from 400 to 700 nm that photosynthetic organisms are 

able to use in the process of photosynthesis. This spec

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tral region corresponds more or less with the range of 

light visible to the human eye.

Illuminance: This is the total luminous flux incident on a 

surface, per unit area. It is a measure of how much the 

incident light illuminates the surface,

Irradiance: In radiometry, irradiance is the radiant flux 

(power) received by a surface per unit area. The SI unit 

of irradiance is the watt per square meter (W/m²). 

Sample Data

The graph shows the measurement of light intensity ver

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sus distance using the PS-3213 Wireless Light Sensor 

Luminous 

Intensity 

(candelas)

Luminous 

Flux 

(lumens)

Illuminance 

(lux = lumens/m²)

Luminance 

(candelas/m²)

Precise Metrics for Lighting: Luminous Flux (lumens), Luminous Intensity (candelas), Illuminance (lux = lumens/m²). and Luminance (candelas/m²)

Содержание PS-3213

Страница 1: ...n watts per square meter The Ambient Light Aperture also measures UVA ultra violet A and UVB ultra violet B allowing ultra violet index UVI to be calculated PASCO Data Collection Software will display...

Страница 2: ...ttery Status LEDs operate as follows depending on the type of connection For a wireless Bluetooth connection Logging PASCO wireless sensors can either stream live data to a compatible device for real...

Страница 3: ...tant to making the sensor simple and always ready to use so all of the PASCO wireless products are designed for long battery life For example the sensor turns itself off after a few minutes of inactiv...

Страница 4: ...e for more information about experiments Or enter Light into the Search window at www pasco com Measurements The Spot sensor measures relative light levels in red green blue and white The Ambient sens...

Страница 5: ...his Class A digital device complies with part 15 of the FCC Rules Operation is subject to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept an...

Страница 6: ...The Mac Mini and MacBook Air were updated with Bluetooth SMART support in 2011 The MacBook Pro was updated in 2012 The Mac Pro that debuted in December 2013 has Bluetooth SMART support Exception Befor...

Страница 7: ...n with wave lengths between 315 and 400 nm UVB Ultraviolet B is ultraviolet radiation with wave lengths between 290 and 320 nm comprising less than 1 per cent of the ultraviolet radiation that reaches...

Страница 8: ...1240 a PASCO Basic Optics Light Source OS 8470 a PASCO Track and PASCO data collection software The illustration shows the equipment setup Equipment setup for measurement of light intensity versus dis...

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