Economic and Environmental Effects of Replacing Fluorescent Lights with LED Fixtures: A Case Study at Utsunomiya University, Japan

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Other Title
  • LED照明導入の経済・環境効果とその制度的実現条件―宇都宮大学の定量評価に基づく一考察
  • LED ショウメイ ドウニュウ ノ ケイザイ ・ カンキョウ コウカ ト ソノ セイドテキ ジツゲン ジョウケン : ウツノミヤ ダイガク ノ テイリョウ ヒョウカ ニ モトズク イチ コウサツ
Published
2025-09-01
Resource Type
departmental bulletin paper
Publisher
宇都宮大学国際学部

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Description

This study quantitatively evaluates the economic and environmental impacts of replacing fluorescent lighting with LED fixtures at Utsunomiya University, Japan. Based on an actual implementation conducted in collaboration with the university’s facilities division, the study models the transition from two 40W fluorescent tubes to a single 25W LED fixture and analyzes three levels: individual units, laboratories, and the university as a whole (approximately 7,000 fixtures). Key indicators include annual cost savings, CO₂ emissions reduction, and payback periods. Results show that LED lighting reduces power consumption by about two-thirds, yielding substantial savings and environmental benefits. Each unit saves approximately ¥3,821 and 0.059 tons of CO₂ annually. At the university scale, savings reach ¥38.2 million and 588.6 tons of CO₂ per year. A comparison between two implementation scenarios—full conversion in the first year and phased conversion over seven years—reveals that early full deployment generates over ¥70 million more in cumulative net savings by year eight, demonstrating the economic inefficiency of delayed action. The study underscores that LED lighting is not only cost-effective but also a strategic approach for achieving sustainable campus operations. However, the slow adoption observed in many national universities stems from structural issues: rigid budgeting practices, fragmented decision-making, and a lack of coordinated national financial support. Therefore, LED implementation should be recognized not merely as a technical upgrade but as a structural policy challenge requiring systemic reforms in institutional governance, national funding frameworks, and energy policy integration.

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