How does office lighting affect your mood?
Editor's note: This article is interpreted from a professional paper. The source and author are shown in the figure below.
The lighting in your office not only affects your ability to see clearly, but also quietly changes your mood and work efficiency. Studies have found that the illumination, color temperature, and distribution of lighting can affect your mood and concentration through non-visual pathways.
A Review of The Effects of Workplace Lighting on Mood
Research background and framework
This paper explores the regulation mechanism of non-visual effects (Non-Image Forming, NIF) of artificial lighting on emotions through a literature review (2010-2020), focusing on the three elements of illuminance (lx), correlated color temperature (CCT) and light distribution, and proposes the optimization direction of office lighting design by combining physiological indicators (melatonin, cortisol) with subjective evaluation.
Key research findings
1. Illuminance Level
·Standards and thresholds: Indonesian standards recommend a minimum of 350 lx, but research has found that the actual acceptable range is wider (200-1500 lx).
·Performance and mood balance:
500-750 lx: Comprehensive improvement of visual performance and positive mood
>1000 lx: Significantly enhances alertness, but may increase visual fatigue.
·Dynamic illumination: Gradual adjustment (e.g. 2800 lx → 200 lx) can improve the circadian rhythm of night shift workers.
2.Correlated Color Temperature (CCT)
·CCT and circadian rhythm:
3000K-4000K: Reduces melatonin suppression, suitable for regular office work .
6000K-17000K: Short-wavelength blue light (480nm) can improve daytime alertness, but night exposure should be avoided.
·User preference: Most subjects prefer 4000K-5000K , which balances color reproduction (CRI) and comfort.
3. Light distribution and design practice
·Uniformity: The ratio of vertical illumination (such as 200-250 lx on the wall) to horizontal illumination (500 lx) needs to be >0.7 to reduce glare.
·Local lighting: It is recommended to supplement directional light in the task area (such as the screen) to avoid reflection interference
4. Non-visual pathway mechanism
·Neuroendocrine pathway: light passes through retinal ipRGC cells → SCN → pineal gland, regulating melatonin/cortisol rhythm.
·Emotional association: high illumination (>2000 lx) activates PRAM pathway and enhances pleasure
5. Industry application suggestions
·Dynamic lighting system: Combined with chronobiology, design an automatic adjustment solution of high color temperature 6500K in the morning + low color temperature 4000K in the afternoon.
·LED technology optimization: Develop spectrally adjustable lamps (such as blue-rich modular design) to adapt to different task requirements.
Standard localization: Refer to regional standards such as Indonesia (SNI 6197:2011) and Japan (JIS Z9110), combining energy consumption and comfort balance.
6.Research limitations and prospects
·Individual differences: Age and latitude (history of light exposure) affect sensitivity, and personalized lighting solutions are needed.
·Long-term effects: Most studies are based on short-term exposure, and long-term health effects (such as the risk of circadian rhythm disorders) need to be tracked.
·Interdisciplinary integration: Combine architectural light environment simulation (such as Radiance) with physiological monitoring (EEG, salivary hormone testing).