記事概要

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記事タイトル
大阪・関西万博照明を巡る対談
発刊年月日
2026年5月 Vol.110 第3号
著者名
前田 美江
企業・団体名
記事種別
総説・解説・座談会など
抄録(ABSTRACT)
This paper presents a case study of the outdoor lighting design implemented at the Expo 2025 Osaka, Kansai, based on a roundtable discussion among lighting designers and researchers. The project was guided by the lighting concept of “Atarashii Yoru” (Updated Nighttime Scenes in Lighting), which articulated a design intent to move away from brightness-oriented nightscapes toward a more adaptive and environmentally responsive nocturnal environment. To translate this concept into practice, the lighting plan adopted a luminance-oriented evaluation framework rather than conventional horizontal illuminance criteria. A site-wide zoning strategy was established, referencing principles associated with the CIE and adapted to the conditions of a large-scale temporary exhibition site. The lighting guidelines defined design conditions such as vertical luminance limits, control of upward light emission, and gradual transitions between zones with differing brightness requirements. Implementation involved coordination with individual pavilion designers, on-site luminance measurements, and post-installation dimming adjustments to maintain consistency between the conceptual intent and the realized lighting environment. The use of luminance imaging enabled evaluation of perceived brightness in closer alignment with human visual experience. By documenting how a lighting concept was systematically translated into design guidelines, evaluation criteria, and operational adjustments, this case study provides practical insights for future large-scale outdoor lighting projects and contributes to discussions on integrating design concepts with technical standards in lighting practice.
図表タイトル

図1 新しい夜のコンセプトヴィジュアルの一部1) Fig.1 Part of the “Atarashii Yoru” (Updated Nighttime Scenes in Lighting) concept visual.
図2 会場のゾーンニングマップ Fig.2 Site zoning map.
図3 大屋根リング上のスカイウォーク Fig.3 Pedestrian walkway (Skywalk) on the grand ring (Oyane Ring)
図4 東ゲートに掲げられた国旗 Fig.4 The national flags displayed at the east gate.
図5 西ゲートに掲げられた国旗 Fig.5 The national flags displayed at the west gate.
図6 来場者が行き交う万博会場 Fig.6 The Expo site with visitors passing.
図7 座談会の参加者 左から前田,髙橋,吉澤,黒田,東海林,後藤の各氏 Fig.7 Participants in the roundtable discussion.

キーワード
Expo 2025 Osaka | 屋外照明計画 | outdoor lighting design | lighting design guidelines | light pollution control | lighting zoning | luminance criteria | 大阪・関西万博 | 輝度基準 | 照明ゾーニング | 光害抑制 | 照明ガイドライン | Kansai

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