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Year: 2020

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Comparison of office lighting alternatives in terms of integrative lighting [Megaron]
Megaron. Ahead of Print: MEGARON-29577 | DOI: 10.14744/megaron.2021.29577  

Comparison of office lighting alternatives in terms of integrative lighting

Elif Erkoç Kaplan1, Leyla Dokuzer Öztürk2
1İstanbul Esenyurt University, Faculty of Engineering and Architecture, Department of Interior Architecture, İstanbul
2Yıldız Technical University, Faculty of Architecture, Department of Architecture, Department of Construction Information, İstanbul

Problem: It is well known that light has biological and behavioural effects in addition to its visual effects. These effects are described as non-image-forming or non-visual responses. Lighting design considering the visual and non-visual effects of light is expressed in terms such as integrated lighting or human centric lighting. However, there is still no consensus on the illuminance and colour temperature to be provided depending on the type of task or activity in the sense of human centric lighting.

Aim: The aim of this study is to determine the lighting conditions in an office that are biologically effective, meet the visual requirements and at the same time are rated as positive by the occupants.

Method: For this purpose, four static lighting scenarios and one dynamic lighting scenario are created in an office room, which differ in terms of illuminance and correlated colour temperature. These scenarios are compared with regard to visual and non-visual effects of light through surveys and α-opic equivalent daylight (D65) illuminance calculations.

Scope: The composition of static scenarios are ‘500 lx, 4000 K’, ‘1000 lx, 5500 K’, ‘1250 lx, 4000 K’, 1500 lx, 5500 K’. The limits of the dynamic scenario are ‘500 lx-1000 lx’ and ‘3500 K-5500 K’. These values are provided on the task area of the worktable chosen as reference to adjust the scenarios through lighting control system. In order to determine the biological potential of light quantitatively, the melanopic equivalent daylight illuminance was calculated for each working table in the office room. The spectral irradiance data measured at eye level were used in this calculation. In addition to the questions about the determination of the emotional states of the participants, questions about the evaluation of the lighting scenario with regard to illuminance, colour temperature of light, influence on the working conditions and ambient atmosphere were also included in the questionnaire. The statistical evaluation of the survey data was carried out for two different conditions, a long-term and a short-term study. Academic staff working in the mock-up room participated in the long-term study, in which each scenario was implemented for two weeks. The participants of the short-term study, in which each scenario was applied for twenty minutes, were academicians, doctoral and master's students.

Findings: It became apparent that high illuminance and/or cool colour of light are effective in feeling alert, rested and energetic. However, the preference of the participants was generally in favour of the neutral light colour. Regarding illuminance 500 lx was evaluated as low and 1500 lx as high. The scenario that was found to be the most positive in terms of the illuminance, the colour temperature of light and its effect on the working conditions in both long- and short-term study was '1250 lx, 4000 K'. The appreciation of the neutral light colour can also play a role in this result. It was found that the variable ambient atmosphere in dynamic lighting is more natural than static scenarios with 500 lx and 1000 lx.

Result: Preferences may conflict with each other in terms of visual and non-visual effects of light. Instead of continuously using scenarios with high illuminance and/or cool light colour, the implementation in shorter periods of time, in which people have to feel more alive and alert, can be a rational and balanced solution.

Original value: The results of this study, in which the visual and non-visual effects of lighting scenarios with different illuminances and colour temperatures on office workers are assessed, can be considered to determine the optimal conditions for integrated lighting in offices.

Keywords: Human centric lighting, illuminance, colour temperature, static lighting, dynamic lighting


Büro aydınlatma alternatiflerinin bütünleyici aydınlatma açısından karşılaştırılması

Elif Erkoç Kaplan1, Leyla Dokuzer Öztürk2
1İstanbul Esenyurt Üniversitesi, Mühendislik ve Mimarlık Fakültesi, İç Mimarlık Bölümü, İstanbul
2Yıldız Teknik Üniversitesi, Mimarlık Fakültesi, Mimarlık Bölümü, Yapı Bilgisi Anabilim Dalı, İstanbul

Işığın görsel etkilerinin yanı sıra biyolojik ve davranışsal etkilerinin de olduğu bilinmektedir. Bu etkiler görüntü oluşturmayan ya da görsel olmayan tepkiler olarak tarif edilmektedir. Işığın görsel ve görsel olmayan etkilerini dikkate alan aydınlatma tasarımı bütünleşik aydınlatma ve insan odaklı aydınlatma gibi terimlerle ifade edilmektedir. Bununla birlikte insan odaklı aydınlatma anlamında işleve göre sağlanması gereken aydınlık düzeyi ve renk sıcaklığı konusunda henüz bir fikir birliği yoktur. Bu çalışmada bir büro hacminde aydınlık düzeyi ve benzer renk sıcaklığı bakımından farklı dört statik aydınlatma ve bir dinamik aydınlatma senaryosu oluşturulmuştur. Bu senaryolar ışığın görsel ve görsel olmayan etkileri açısından istatiksel analiz ve hesaplama yolu ile karşılaştırılmıştır. Işığın biyolojik potansiyelini nicelik olarak belirlemek üzere deney hacmindeki her çalışma masası için melanopik eşdeğer günışığı aydınlık düzeyi hesaplanmıştır. Bu hesaplamada göz hizasında ölçülen tayfsal erkesel aydınlık veri alınmıştır. İstatistiksel değerlendirme, uzun ve kısa süreli çalışma olmak üzere iki farklı koşul için yapılmıştır. Her senaryonun iki hafta boyunca uygulandığı uzun süreli çalışmaya deney hacminde çalışan akademisyenler katılmıştır. Her senaryonun yirmi dakika süreyle uygulandığı kısa süreli çalışmanın katılımcıları akademisyenler, doktora ve yüksek lisans öğrencileri olmuştur. Yüksek aydınlık düzeyi ve/ya da soğuk ışık renginin uyanık, dinlenmiş ve enerjik hissetmede etkili olduğu ortaya çıkmıştır. Bununla birlikte, katılımcıların tercihi genel olarak ılık renkli ışık ile oluşturulan yüksek aydınlık düzeyinden yana olmuştur.

Anahtar Kelimeler: İnsan merkezli aydınlatma, aydınlık düzeyi, renk sıcaklığı, statik aydınlatma, dinamik aydınlatma




Corresponding Author: Elif Erkoç Kaplan, Türkiye


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