The Impact of Lighting on Mood: A Psychological Perspective

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Lighting, often overlooked, plays a pivotal role in our psychological and physiological wellbeing. The intensity, direction, and color of light can significantly influence our mood, productivity, and sleep patterns. This article explores the psychological effects of lighting, backed by scientific research, and offers insights into optimizing lighting for mental health.

The Science of Light and Mood

Lighting conditions can have profound effects on our mood and emotions. A study published in the Journal of Consumer Psychology found that the more intense the lighting, the more intense the participants’ emotions—both positive and negative. Bright light can heighten feelings of warmth and happiness in positive situations, but it can also intensify anger and annoyance in negative situations.

Lighting and Circadian Rhyth

Our bodies have an internal clock, known as the circadian rhythm, which regulates sleep-wake cycles. Light is a primary cue for this rhythm. Exposure to natural light during the day can boost mood and energy, while exposure to artificial light at night can disrupt sleep patterns. A study in the Journal of Clinical Sleep Medicine found that exposure to short-wavelength light, also known as blue light, before sleep can suppress melatonin production and delay sleep.

Seasonal Affective Disorder (SAD) and Light Therapy

Seasonal Affective Disorder (SAD) is a type of depression that’s related to changes in seasons, typically starting in the fall and continuing into the winter months. It’s believed that the reduced level of sunlight in fall and winter may disrupt your body’s internal clock and lead to feelings of depression. Light therapy, which involves sitting near a device that emits bright light, has been shown to be effective in treating SAD.

The Impact of Color Temperature

Color temperature, measured in Kelvin (K), can also affect mood. Lower color temperatures (2000K-3000K) produce a warm, yellowish light that’s relaxing and comforting, while higher color temperatures (4600K-6500K) produce a cool, bluish light that’s energizing and helps improve concentration and alertness.


Lighting is a powerful tool that can significantly impact our mood and overall mental health. By understanding the psychological effects of lighting and learning how to optimize lighting in our homes, workplaces, and public spaces, we can create environments that promote wellbeing and productivity.


  1. Mehta, R., Zhu, R. (2013). Blue or Red? Exploring the Effect of Color on Cognitive Task Performances. Science Direct.
  2. Wright, K. P., McHill, A. W., Birks, B. R., Griffin, B. R., Rusterholz, T., & Chinoy, E. D. (2013). Entrainment of the human circadian clock to the natural light-dark cycle. Current Biology.
  3. Chang, A. M., Aeschbach, D., Duffy, J. F., & Czeisler, C. A. (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences.
  4. Roecklein, K. A., Rohan, K. J. (2005). Seasonal Affective Disorder: An Overview and Update. Psychiatry (Edgmont).
  5. Golden, R. N., Gaynes, B. N., Ekstrom, R. D., Hamer, R. M., Jacobsen, F. M., Suppes, T., Wisner, K. L., & Nemeroff, C. B. (2005). The efficacy of light therapy in the treatment of mood disorders: a review and meta-analysis of the evidence. American Journal of Psychiatry.
  6. Park, B. C., & Lee, Y. A. (2018). The Effects of the Color Temperature of LED Lighting on Visual Sensibility. Journal of the Korean Society of Design Culture.

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