視頻會議室燈光設(shè)計簡介(英文版)-wenkub
2023-07-10 22:13:05 本頁面
【正文】 To begin working with lighting, some basic lighting terms should be understood. Some of the typical terms used in discussing and designing lighting systems are related to those for projection and display technologies.Illuminance is the light level incident on a surface or plane from a source or sources. It39。s installed is this correctly referred to as a light fixture.Light Reflectance Value (LRV) is a measurement often applied to painted and other room finishes indicating the percentage of light reflected from a particular surface independent of the color. LRV ranges from 0 to 100, with higher numbers indicating lighter finishes and lower numbers indicating darker colors.Luminance ratio and contrast ratio refer to the mathematical ratio of the lightest area to the darkest area of a visual field of view. Lighting designers will often use the term luminance ratio in discussing room environments and mostly nonelectronic illuminated surfaces. AV designers will use the term contrast ratio mostly in describing video projectors and displays. Their fundamental definitions, however, are the same. Color Rendering Index (CRI) is a measure of the effect a light source has on the perceived color of objects relative to being illuminated by a reference light source. CRI is applied to light sources and is measured on a scale of 1 to 100, where 100 is the most accurate color rendering.Color Temperature (or correlated color temperature, CCT) is a measure of the color appearance of a light source. Measured on the Kelvin scale (K), socalled “warm” light sources have a more yellowish appearance and have a lower CCT (2,000 to 3,000 K), while “cool” sources tend to appear more white or bluish and measure above 4,000 K. Though physics majors will recognize that the Kelvin scale is based on star temperature in degrees Kelvin, lighting designers and the “IESNA Lighting Handbook,” another essential industry lighting publication that explains concepts, techniques, applications, procedures and systems, omit the word “degrees” when using the term.The design approach To create an effective lighting design, the fundamentals above are used within an appropriate design approach. For videoconferencing, the design approach is based on the concepts of photography and videography. Many will be familiar with the traditional key, fill, and backlighting elements used in these fields. While the fill and key light concepts apply well to the architectural/videoconferencing environment, the traditional backlighting technique isn39。s back and side walls.Each of these three elements must be properly ddressed to create a good videoconferencing picture. The difficulty es in the application of these concepts to an architectural environment such as a conference room where studio lighting isn39。s a presenter who is to be on camera and is located adjacent to a projected display at the front of the room. Most luminaires for this purpose are good at keeping light on the wall and out of the middle of the room, but lack of side control is a problem because having more light sidetoside can mean fewer fixtures to provide good, even wall coverage. However, this is at odds with what you need on the wal
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