The luminous intensity distribution curve is a curve reflecting the luminous intensity distribution of the luminaire presented for the characteristic section plane or planes of a given luminaire, which are planes passing through the longitudinal (C90) and transverse (Co) axial section of the luminaire.
The diagram shows the luminous intensity distribution of the luminaire in two planes:
They are defined as shown below.
A light intensity curve is a graph showing the distribution of light emitted by a lighting fixture in specific planes – longitudinal (C90-C270) and transverse (C0-C180). It helps us understand how light propagates in space.
The graph shows the intensity of light in different directions. The lines on the graph represent light intensity levels, and their shape indicates whether the distribution is symmetrical, asymmetrical, focused, or diffuse.
Asymmetrical light distribution means that light is not distributed evenly in all directions. This type of distribution is often used in street lighting to direct light onto roadways and sidewalks rather than onto building facades.
Lx (lux) is a unit of illuminance that measures the amount of light falling on a surface. 1 lux is one lumen per square meter.
The most important parameters include: luminous flux (lm), illuminance (lx), color temperature (K), color rendering index (CRI), and light distribution.
3000K is the color temperature of light, which corresponds to a warm, yellowish color – ideal for living spaces and relaxation areas.
Luminous intensity (cd) can be calculated as the ratio of luminous flux (lm) to the solid angle (sr):I=ΦΩI=ΩΦwhere:• II – luminous intensity in candela (cd),• ΦΦ – luminous flux in lumens (lm),• ΩΩ – solid angle in steradians (sr).
The choice depends on the application:• Symmetrical – for general lighting,• Asymmetrical – for illuminating streets, facades, and warehouses,• Concentrated – for accentuating details,• Diffused – for even lighting of large areas.
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