The point method is a procedure used to predetermine the illuminance at different locations within lighting installations. It involves a comprehensive assessment of the direct and interreflected components of illuminance. By separately calculating these components and subsequently summing them, the total illuminance at a particular point can be determined accurately. This method provides a systematic approach to designing lighting systems that meet the desired illuminance levels at specific locations.
Calculation Process
The point method's effectiveness lies in its rigorous calculation process. To begin, luminaire photometric data, which describes the luminous intensity distribution of a lighting fixture, is required. This data is typically presented in the form of photometric files that contain information such as light intensity, beam angles, and luminous flux. Armed with this data, lighting professionals can proceed with the following steps:
1. Determining the direct component:
- Based on the luminaire's photometric data, the direct component of illuminance is calculated.
- This component represents the illuminance generated by the luminaires directly hitting the target surface without any reflections.
2. Assessing the interreflected component:
- Through separate calculations, the interreflected component of illuminance is determined.
- This component considers the illuminance resulting from the reflections off the surfaces within the room.
3. Summing up:
- The direct and interreflected components are combined to obtain the total illuminance at the particular point being analyzed.
- This final value indicates the overall brightness and light distribution at that specific location.
Significance of the Point Method
The point method holds considerable significance in lighting installations for several reasons:
1. Precision in illuminance prediction:
- By utilizing luminaire photometric data, the point method allows professionals to accurately determine illuminance levels at specific points within a space.
- This precision is crucial in ensuring that lighting requirements, standards, and guidelines are met effectively.
2. Flexibility in lighting design:
- The point method enables lighting designers to customize illuminance levels based on specific needs.
- By calculating illuminance at different points, they can effectively manipulate light distribution to create desired lighting schemes or emphasize particular areas within a room.
3. Optimization of lighting layouts:
- Through the point method, lighting designers can assess potential lighting solutions and determine the most effective layout for achieving desired illuminance levels.
- This optimization ensures that spaces are adequately lit, reducing the likelihood of under-lit or over-lit areas.
The point method serves as a valuable tool in the lighting industry, facilitating the design and implementation of optimal lighting environments. By accurately calculating illuminance levels at various locations in lighting installations, professionals can create visually appealing and functional spaces. Understanding the point method empowers lighting designers to make informed decisions and ensures that lighting installations meet the criteria of efficiency, performance, and aesthetics.