視頻會議室燈光設(shè)計簡介(英文版)(完整版)
【正文】 o 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 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 wall behind a presenter and next to a projection screen.Don39。 Be sure that back and side walls are evenly lit at about the same level as the participants (this may need to vary depending on how light or dark the finish color is). s councils for both InfoComm International and NSCA. Contact him at 6 / 6。 Select a table finish that39。s important to consider the type of display being used in the videoconferencing environment. While a directview display such as a CRT, plasma, or LCD monitor is very tolerant of light, front and rear projected displays require more attention to luminaire selection and overall lighting design. Many lighting designers are using indirect lighting approaches that work well for typical conference rooms, classrooms, and open offices without projected displays. However, this can be problematic when projected displays are to be used in a videoconferencing environment because the relatively uncontrolled light in these designs may put too much light on the display when ligh
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