Chrono‑Light Thermophysiology Response (CLTR) Dataset

Synopsis The Chrono-Light Thermophysiology Response (CLTR) dataset provides a synchronized, multimodal record of indoor environmental exposure, thermophysiological responses, behavioral adaptation (fan use), and protocol annotations collected in a repeated-measures laboratory study conducted under warm indoor conditions. The dataset is intended to support research in indoor environmental quality, human thermophysiology, personal comfort systems (e.g., fan use), and multimodal time-series modeling. Each participant completed four sessions, defined by two orthogonal factors: Illuminance level: bright vs. dim Time of day: morning vs. midday Each session follows the same protocol structure: Block 0 (B0): 40-minute acclimation/adaptation Blocks 1–3 (B1–B3): three sequential warm-exposure blocks with repeated fan-cooling and re-warming phases Within Blocks 1–3, participants experience a systematic sequence of fan cooling, passive re-warming, fan-free control, and steady-state periods, enabling isolation of the effects of thermal/visual conditions on physiological and perceptual responses. The dataset release includes: Session metadata and de-identified participant descriptors An authoritative minute-resolved protocol timeline (Blocks 0–3) with absolute timestamps Minute-aligned tables for indoor environment, fan behavior, skin temperature, and questionnaire events High-frequency wearable physiology (Empatica Embrace Plus) filtered to session time windows High-frequency laboratory physiology (BIOPAC / BioNomadix) exported as raw, analysis-ready time series with a channel dictionary Outdoor meteorology (5-minute resolution) for contextual analyses during the experimental period Dataset summary Category Details and parameters Experimental design 2×2 factorial design crossing Time of Day (Morning: 07:00; Midday: 14:00) and Light Intensity (Bright vs. Dim). Participants 20 healthy adults (10 M / 10 F), aged 19–30 years.; BMI 18.5–24.9 kg/m2. Sessions(per participant) 4 sessions (≈ 185 min of structured phases per session), one in each condition: BRI‑MOR, BRI‑MID, DIM‑MOR, DIM‑MID. Light modalities Bright: Vertical EDI ≈299 lx; Dim: Vertical EDI ≈39 lx (emulated D93 spectrum). Thermal environment Warm but controlled indoor climate (air temperature ≈ 30 °C) in a windowless climate chamber. Block 0Adaptation 40-min phase: dark adaptation (EDI ≈5.57 lx) and thermal stabilization. Block 1 & 2Repeated blocks 55 min each: fan-at-constant-speed (5 min), skin-rewarming (10 min), fan-free-control (10 min), steady-state (30 min). Block 3Final block 35 min: same sequence as Blocks 1 & 2, but with a shortened 10-min steady-state. Environmental Data Indoor environmental data sampled at 1 Hz resolution using the instrumented columns and tabletop setup. Outdoor meteorology variables are provided on a 5-minute grid for contextual analyses. Physiological data Laboratory-grade skin temperature (multi-site), high-frequency laboratory physiology (BIOPAC), and wearable monitoring (Empatica) Subjective data 7-point scales for thermal sensation, comfort, pleasure, and preference. Behavioral data Fan speed adjustment quantified via current drawn by the fan during fan-free-control periods. Activity/clothing Sedentary desk work (1.1 met); standardized summer clothing (0.3 clo). NOTE: To obtain the dataset, please contact the corresponding author via the Zenodo request form. Collaboration inquiries are also welcome—feel free to indicate your interest and proposed contribution when you submit the request.