Overview
Research led by scientists at Penn State indicates that the spectral composition of indoor lighting influences human thermal perception. This work suggests that the feeling of being too warm or too cold indoors may not solely depend on thermostat settings, but also on the specific characteristics of the indoor lighting spectrum. Subtle variations in white light were observed to impact whether indoor environments were perceived as cooler or warmer.
Research Context
The study addresses the factors contributing to perceived indoor temperature. While thermostat settings are a primary control mechanism for indoor climate, this research explores an additional, less commonly considered variable: the spectral quality of artificial illumination. The premise is that human perception of thermal comfort can be modulated by visual cues, specifically the precise spectral distribution within white light sources.
Approach
The research involved an investigation into how the spectrum of indoor lighting affects individuals' perception of temperature. The methodology focused on observing responses to subtle alterations in white light. The study aimed to identify whether variations in light spectrum could lead to different subjective thermal comfort experiences.
Findings
The core finding is that the spectrum of indoor lighting plays a role in how people perceive temperature. The research indicates that subtle changes in white light can lead to indoor rooms feeling either cooler or warmer to occupants. This suggests a direct link between the spectral characteristics of artificial illumination and human thermal sensation.
Why This Matters
This research matters because it identifies an additional factor, beyond thermostat settings, that influences perceived indoor thermal comfort. Understanding that the spectrum of indoor lighting affects how people perceive temperature could inform strategies for environmental control in buildings.
Research Source
Penn State