Ключевые слова: abstract, audience, background, black, bright, business, ceiling, classroom, close, computer, conference, corporate, design, digital, education, entertainment, equipment, facilities, facility, focus, hall, hang, lcd, led, lens, light, meeting, modern, multimedia, object, off, office, on, presentation, projector, room, seminar, show, side, slide, spotlight, switch, technology, thailand, tool, tube, up, video, wall, white,