# What is perpendicular illuminance?

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

## How is vertical illuminance measured?

For some applications including museums or retail spaces, vertical illuminance is also of interest within the space. Divide the vertical surfaces in equally sized square sections and measure and record the illuminance at the grid intersections.

## 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.

## How is luminance calculated in dialux Evo?

Re: How to calculate luminance L in dialux evo 9

If you want to get the luminances [cd/m2] on the outside of the building, you only need to select the floor element or another surface (like wall of the building) in the “Calculation object” tool and you will automatically receive luminance results.

## 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.

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## How do you perform a lux test?

Test how lux readings change with distance from a fixed light source. For example, stand directly under a ceiling light, hold your phone with the screen facing up, and move the phone up and down. Alternatively hold the phone sideways and aim it toward a floor lamp as you walk closer to and farther away from the lamp.

## What is the formula for illuminance?

The equation of the illuminance, E, of a small light source is E = P/ 4(pie)d^2, where P is the luminous flux (in lumens, lm) of the source and d is its distance from the surface.

## How are illuminance levels calculated?

They can then be related to luminance. While illuminance measures light incident on a surface, luminance is the light emitted or reflected by that surface in candela/m2 or “nits”. The values of luminance ​L​ and lux ​E​ are related through an ideal surface that emits all light with the equation ​E = L x π​.

## How do you measure illuminance?

Lighting professionals use a light meter (also called an illuminance meter or lux meter) to measure the amount of light in a space/on a particular work surface. The light meter has a sensor that measures the light falling on it and provides the user with a measurable illuminance reading.

## What is point 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.

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## What is vertical illuminance?

In other words, vertical illuminance can be defined as the measure of light perception by camera and our eyes when reflected off a surface. It is measured in the unit “lux” and mostly used for televised games and events.

## 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.