Planning and practice of illumination of the Nagano Olympics Memorial Arena for general-purpose use

External appearance of the “M-Wave” arena

Fig.1 External appearance of the “M-Wave” arena

Indoor appearance of the M-Wave arena

Fig.2 Indoor appearance of the M-Wave arena

Lighting model for interior of the M-Wave (1/100 scale)

Fig.3 Lighting model for interior of the M-Wave (1/100 scale)

Test appearance of glare evaluation by sensuality evaluation

Fig.4 Test appearance of glare evaluation by sensuality evaluation

    Construction of the arena-popularly known as the “M-Wave”-for the speed-skating competition of the 1998 Nagano Winter Olympics was completed in 1996. As one of the world’s largest arenas with a suspended wooden roof, this “Nagano Olympic Memorial Hall” houses the first standard 400-m “double track” in Japan.

    Lighting for indoor speed-skating competition arenas is recommended by Japan Industrial Standard (JIS) Z9124 (“Lighting standard for skiing grounds and ice skating rinks”), which floodlight aimed at the tracks from luminaires placed around the inside and outside tracks. However, for accommodating various other sporting (such as ball games) and non-sporting events during the summertime, the M-Wave incorporates movable stands and machinery for rolling out artificial turf for these events. Accordingly, the lighting for these events must also accommodate wide-ranging purposes and show off the beauty of the ceiling (which is composed of a tiered structure of larch timbers).

    Combining assurance of high brightness (vertical luminance: 1000 lux; horizontal luminance: 1500 lux for TV shooting) and prevention of glare and assuring spatial lighting and ball visibility needed for ball games were the main challenges. Accordingly, these challenges were taken up, and a lighting plan was worked out through various simulations and model experiments.

    In the basic lighting implemented, the luminaires are fixed abobe the upper part of the back stand and main stand,and in a line to catwalks (i.e., narrow pathways suspended in a high place) .The luminaires for lighting up the ceiling space and arena interior are arranged across the whole arena (excluding the course width). Taking lifetime and efficiency of a lamp into account and considering appropriate color-rendering properties and color temperature for HDTV broadcasting, high-color rendition metal-halide lamps are utilized.

    Moreover, a total of 462 light units—63 units fixed to each catwalk above the upper parts of the back stand and main stand (height: 22 m) and 336 units fixed to the ceiling catwalk (height 17 to 33 m)—are fitted. As for the 164 floodlight units on the east- and west-facing (i.e., not main) sides (which can easily get into the line of sight of skaters), horizontal-type black louvers for reducing glare are installed.

    The aiming of the floodlights fixed to the ceiling catwalks is done in the anticlockwise direction (i.e., “cycling aiming”) from floodlights separated at some distant from the course in such a way that light is not shone from in front of skaters coming round the track in the anticlockwise direction, and skaters' glare is reduced accordingly.

    In the case of ball games, to assure spatial illuminance and horizontal illuminance of the in-field, the aiming of the ceiling-catwalk floodlights is set up so that intersecting beams (i.e., cross aiming) have a long irradiation range over an area that generates no glare.

    As well as illuminance and luminance measurements, other lighted environment evaluations (glare measurement and sense/impression evaluation) were used to investigate the effectiveness of this lighting scheme. It was subsequently confirmed that the appropriate lighting environment for speed skating events and ball games was secured according to the design plan.

    The engineers who first took up this challenge of creating a multi-purpose dome for providing an ice surface during winter and an artificial-turf surface during summer—namely, Kiyoshi Sakurai, Shozo Kagehira, and Yoichiro Machino of Kumei Sekkei Co. Ltd.; Tadashi Jonai, Shigeaki Fujita, and Kazuo Murakami of Kajima Corporation; Kazumune Kito of Nippon Densetsu Kogyo Co. Ltd.; and Tetsuji Tanaka and Katsuji Ishizaki of Iwasaki Electric Co. Ltd.—were awarded the “Japan Illumination Award” by the Illuminating Engineering Society of Japan in 1998.


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Illuminating
(Lighting Technologies)

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