# What is vertical illuminance?

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Vertical Illuminace is the amount of light falling on a vertical surface or plane. Vertical Illuminance on the projection screen in a Conference Room with electric lighting. … Notice the highest and lowest footcandle levels are indicated in red and blue respectively.

## What is horizontal and vertical illuminance?

The horizontal measurement is known as the horizontal illuminance and is the amount of light that lands on a horizontal surface, such as a tabletop. The vertical measurement is know as the vertical illuminance and is the amount of light that lands on a vertical surface, such as a wall.

## What is horizontal illuminance?

Horizontal Illuminace is the amount of light falling on a horizontal activity plane (also called workplane). Horizontal Illuminance in a Conference Room with electric lighting. … Notice the footcandle levels are highest in the center of the space, under the central luminaires.

## What is perpendicular illuminance?

Perpendicular illuminance: The perpendicular light which strikes on a horizontal surface. Perpendicular illuminance(Adaptive): The perpendicular light which strikes on a horizontal surface.

## What’s the difference between luminance and illuminance?

Illuminance is another key term within the display industry. It’s essential to understand the difference between the two terms so you can adequately measure a display. Whereas luminance refers to the amount of light passing through an object, illuminance refers to the amount of light falling onto a given surface area.

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## How do you calculate horizontal illuminance?

Horizontal Illuminance – Horizontal illuminance at a point is a measure of the lumens incident on the pavement divided by the area. The units are lumens per square meter (lux). Illuminance is not impacted by the pavement’s surface type or the angle of observation.

## What is lighting uniformity ratio?

Uniformity is the ratio of the minimum lighting level to the average lighting level in a specified area. It’s a quality parameter for the overall illuminance distribution.

## How is illuminance defined?

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.

## What is lm W?

Lumens per watt (lm/W) refers to the energy efficiency of lighting: how much visible light you get for a given amount of electricity. For example, a traditional 60 watt incandescent bulb in the US produces 860 lumens.

## What is the unit of illuminance?

Lux, unit of illumination (see luminous intensity) in the International System of Units (SI). One lux (Latin for “light”) is the amount of illumination provided when one lumen is evenly distributed over an area of one square metre.