What is the simple lumen method?

What is the simple lumen method?

In lighting design, the lumen method, (also called zonal cavity method), is a simplified method to calculate the light level in a room. In its simplest form, the lumen method is merely the total number of lumens available in a room divided by the area of the room.

How do you use the lumen method?


  1. Find required lux level.
  2. Select luminaire.
  3. Determine room index.
  4. Determine Number of Fixtures.
  5. Determine Minimum spacing between luminaire.
  6. Determine Number of required rows of luminaire along width of the room.
  7. Determine Number of luminaire in each row.
  8. Axial spacing along luminaire.

What are the factors which affect the correct illumination?

Answer : The factors are as follows: Illumination level Glare Shadow Space height ratio Mounting height of the lamp Area to be illuminated Colour of surrounding walls Movement of the object Utilization factor and Depreciation factor.

What are the methods of lighting calculation?

A number of methods have been employed for lighting calculations, among which may be mentioned: 1. Watts per Square Metre Method 2. Lumen or Light Flux Method 3….Point to Point or Inverse-Square Law Method.

  • Watts per Square Metre Method:
  • Lumen or Light Flux Method:
  • Point to Point or Inverse-Square Law Method:

What is coefficient of utilization in lighting?

Coefficient of Utilization (CU) is a measure of how much light exiting the fixture will fall on a canopy area of a certain size; CU is an important factor to consider in designing an energy efficient Controlled Environment Agriculture (CEA) facility.

How is lumens lighting design calculated?

Calculation in 8 steps

  1. Total wattage of fixtures: Total wattage of fixtures = Number of lamps x each lamp’s watt. Total wattage of fixtures = 2 × 32 = 64 Watt.
  2. Lumen per fixtures. Lumen per fixtures = Lumen efficiency (Lumen per Watt) x each fixture’s watt. Lumen per fixtures = 85 x 64 = 5440 Lumen.
  3. Number of fixtures.

What are the 4 qualities of lighting design?

Lighting for the stage involves manipulating the four major Controllable Qualities of light; Intensity, Color, Direction and Movement; to influence the four functions of stage lighting listed below.

What are the 3 qualities of light?

These basic qualities of light are; INTENSITY, FORM, COLOR, DIRECTION and MOVEMENT.

What are the characteristics of good illumination?

Adequate or good lighting system must possess certain well defined characteristics which are discussed below.

  • Sufficient Quality. Foot candle is the unit measurement of light.
  • Sufficient Quantity.
  • Brightness.
  • Intensity.
  • No contrasts.
  • Right Diffusion.
  • Direct Lighting.
  • Indirect Lighting.

Which factor most important in outdoor illumination?

1: Safety and Security This generates more visibility during the night, adequate outdoor lighting will also keep your home safe from intruders.

How are lumens calculated?

The equation to calculate lumens, when candelas and solid angle of a light source are known is: 1lm = 1cd * sr. Candelas are mostly used to describe brightness of lighting fixtures that produce focused beam of light at a narrower angle in a single direction, such as laser pointer, flashlight and spot light.

What is the lumen method used for?

The lumen method serves to provide approximate calculations for planning indoor lighting systems. The method is used to determine the number of luminaires and lamps required to achieve a given Illuminance.

What is the lightlumen method?

lumen method, flux method. A procedure in lighting design used to determine the number and types of lamps or luminaires required to provide a desired average level of illumination on a work plane; takes into account both direct and reflected light flux.

How to determine the amount of luminaires required for lighting design?

The most popular method of establishing the quantity of luminaires required, the illumination level achieved and the luminaire layout, is to use computer software created specifically for lighting design. It is important to LIGHTING DESIGN GUIDEwww.eaton.eu5 Lighting Design Guide00

How do you calculate lumens in engineering drawing?

The simple formula is as follows: E = F / A. Where E is the average (or minimum) illumination level at the work plane (in lux), F is the useful lumen output of all sources (lumens) and A is the total surface area of the working plane (in m²).