Lighting Terms: Luminous Flux and Illuminance

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Questions and Answers

What is the correct sequence of steps to create a new indoor contour?

Draw new indoor contour, select entire project, and then draw new building icon
Draw new building icon, draw new indoor contour, and then select each room
Select entire project, draw new indoor contour, and then select each room
Draw new building icon, select entire project, and then draw new indoor contour (correct)

What is the purpose of selecting each room in the project?

To define the boundaries of each room (correct)
To select the entire project
To draw a new indoor contour
To create a new building icon

What icon should be selected first to create a new indoor contour?

Draw new building icon (correct)
Select entire project
Draw new indoor contour
Select each room

What should be done after completing the selection of the project?

Draw new indoor contour (C) Signup and view all the answers

What is the purpose of selecting the entire project?

To define the project boundaries (A) Signup and view all the answers

What is the primary purpose of clicking on the import plan in DIALUX EVO2?

To insert an AutoCAD project file into DIALUX EVO2 (D) Signup and view all the answers

What is the correct sequence of actions when setting up the drawing in DIALUX EVO2?

Draw origin and x-axis, and then specify scale (C) Signup and view all the answers

What is the step that comes after selecting the room to be illuminated?

Name the room (D) Signup and view all the answers

What is the purpose of specifying the room's height?

To calculate the number of luminaires needed (B) Signup and view all the answers

What is the purpose of specifying the scale in DIALUX EVO2?

To set the units of measurement for the project (B) Signup and view all the answers

What information is required to specify the application of the room?

The type of lighting needed for the room's purpose (C) Signup and view all the answers

What is the result of importing an AutoCAD project file into DIALUX EVO2?

The AutoCAD project file is inserted into DIALUX EVO2 (A) Signup and view all the answers

What is the purpose of the x-axis in DIALUX EVO2?

To establish the horizontal axis of the drawing (D) Signup and view all the answers

What is the main purpose of identifying the wall zone?

To determine the type of lighting fixtures to use (D) Signup and view all the answers

What is the correct sequence of steps after selecting the room to be illuminated?

Name the room, specify the height, specify the application, specify the wall zone (B) Signup and view all the answers

What is the initial step in the process described?

Choose the light option from the toolbar (B) Signup and view all the answers

What happens after selecting the appropriate luminaire in the room?

Clicking in automatic arrangement for spaces is enabled (B) Signup and view all the answers

What is the purpose of clicking in automatic arrangement for spaces?

To arrange the spaces in the room (C) Signup and view all the answers

What is the final step in the process described?

Selecting the entire project from the toolbar (B) Signup and view all the answers

What is the relationship between the light option and the luminaire in the room?

The light option is a prerequisite for selecting a luminaire (B) Signup and view all the answers

What is the unit of measurement for luminous flux?

LUMEN (D) Signup and view all the answers

What is the formula for calculating the uniformity factor?

Emin/Eavg (C) Signup and view all the answers

What is the acceptable value for the uniformity factor?

Above 0.4 (D) Signup and view all the answers

What is the purpose of a polar curve?

To show the distribution of light emitted by a source (C) Signup and view all the answers

What is the typical height of a work plane?

70-80 cm (B) Signup and view all the answers

What is the unit of measurement for illuminance?

LUX (C) Signup and view all the answers

What is the formula for calculating illuminance?

LUMEN/M2 (B) Signup and view all the answers

What is the term for the amount of light emitted by a source in all directions?

Luminous flux (C) Signup and view all the answers

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Study Notes

Lighting Terms

Luminous flux (Φ) is the amount of light emitted by a source in all directions, measured in lumens (lm).
Illuminance (E) is the measure of light intensity on a surface, measured in lux (lx), where 1 lux = 1 lumen per square meter (lx = lm/m²).

Uniformity

Uniformity of lighting refers to the equal distribution of light intensity in a space, measured by the uniformity factor (U₀) = Emin/Eavg.
The uniformity factor is acceptable if its value is higher than or equal to 0.4.

Lighting Concepts

Polar curve is a graphical representation of light distribution from a light source, showing how light is distributed in a space.
Work plane height is the height of the surface where tasks are performed, typically between 70 cm to 80 cm above the finished floor level in most applications.

Room Dimensions and Lighting Design

To set up a room in DIALUX EVO2, import the AutoCAD project file, set up the dimensions, and draw the room layout.
Specify the room's height, application, and wall zone.
Select a luminaire and arrange it automatically in the room.
Use the toolbar to choose the entire project and select the appropriate lighting design.