Question 1

What’s illumination diagrams and average area illumination for floodlights?

Accepted Answer

Illumination diagrams for floodlights are quite similar to average area illumination. Illumination diagrams are used by professional lighting manufacturers, while average area illumination appears in photometric test reports. Floodlight illumination diagrams strictly limit the illuminance calculation area to the illumination range enclosed by the half-beam angle, using projection distance as a variable, and provide both the geometric dimensions of the illuminated area and the average illuminance within that area. These diagrams apply to both symmetrical and asymmetrical floodlights, whereas the AAI figure primarily applies to floodlights with symmetrical light distribution. It also uses throw distance as a variable and provides the peak illuminance at the center of the area covered by the half-beam angle, as well as the average illuminance.

Question 2

Light distribution curve or isolux diagram?

Accepted Answer

A light distribution curve is used to describe the distribution of light intensity (in candelas) from a light source in all directions in space. It visually illustrates which directions receive the strongest light and which receive the weakest as light radiates outward from the center of the luminaire. Graphically, it is typically represented using polar or Cartesian coordinate systems, with the graph appearing as “petal”- or “tongue”-shaped patterns radiating outward from the center. This curve serves as the core basis for evaluating the luminaire’s optical performance (such as beam angle and symmetry).

An isolux diagram is used to describe the distribution of actual illuminance (in lux) at various points on a given plane (such as the ground or a work surface) after being illuminated by the luminaire. It is equivalent to displaying the luminaire’s light distribution curve (luminous intensity) on a plane in terms of illuminance. It uses closed curves similar to contour lines on a map to connect points on the plane with the same illuminance; areas where the curves are denser indicate more dramatic changes in illuminance. This chart is primarily used to evaluate the coverage, uniformity, and actual effects of a lighting design in real-world scenarios.

Question 3

What is an Isocandela Diagram?

Accepted Answer

A isocandela diagram is used to depict the curve formed by connecting points where the luminous intensity (in candelas) of a light source is equal in all directions in space; it is typically presented in polar coordinates. It describes how the luminaire distributes its capacity to emit light in different directions and is an inherent optical characteristic of the light source. The isolux diagram, however, shows the curve of points on a given plane (e.g. ground) where the actual illuminance (lux) is equal, which reflects the actual effect of light falling on the surface of an object, which is affected by the installation height, angle and distance. To summarize, the former describes the emission characteristics of a light source, i.e. how it emits light; the latter describes how a surface is illuminated.

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LED Street Light

High Mast Light

Led Flood Light

Solar Flood Light

LED High Bay Light

LED Tunnel Light

LED Garden Light

Led Bollard Light

Solar Street Light

LED Traffic Light

LED Canopy Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing