# What is illumination level?

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## What is the level of illumination called?

Illuminance is the metric that is used to measure the light intensity within a space. It is measured in footcandles or lux – it is the amount of light (lumens) falling on a surface (over any given square foot or square meter).

## How are illumination levels determined?

Determine the Needed Lumens A lumen is a unit measurement of light. To determine the needed lumens, you will need to multiply your room square footage by your room foot-candle requirement. For example, a 100 square foot living room, which needs 10-20 foot-candles, will need 1,000-2,000 lumens.

## What is illuminance value?

Illuminance is ‘The level of light on a surface; measured in lux (lx). Previously called the illumination value. It can be used as a reference measurement of the performance of a lighting system as related to the activity. ‘

## Is lux a level?

A measurement of 1 lux is equal to the illumination of a one metre square surface that is one metre away from a single candle.

Definition of Lux.

Natural Light Condition Typical Lux
Direct Sunlight 32,000 to 100,000
Ambient Daylight 10,000 to 25,000
Overcast Daylight 1000
Sunset & Sunrise 400

## How many lumens is normal daylight?

Daylight or direct sunlight has 120,000 lux or lumens of brightness.

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## What is illumination physics?

1 : the action of supplying or brightening with light or the resulting state. 2 : the luminous flux per unit area on an intercepting surface at any given point. — called also illuminance.

## What is illuminance and luminance?

Illuminance is measured as the amount of light striking a surface. … Luminance, is what we measure off of the surface that has light hitting it. Luminance is the measurement of the product of the incident light and the surface – anything that is reflected.

## What are acceptable lux levels?

For precision & detailed works, the level of light may range between 1500 to 2000 lux. In homes- The recommended illumination levels for homes is often 150 lux. The living and dining rooms may work pretty well with about 25 to 50 lux.

## How many Lux do you need for reading?

Recommended Light Levels by Space

Room Type Light Level (Foot Candles) Light Level (Lux)
Library – Reading / Studying 30-50 FC 300-500 lux