SKP-S Beijing — Atrium Tunable White Retrofit
Project: SKP-S Beijing — Central Atrium & Luxury Walkway relight Location: 87 Jianguo Rd, Chaoyang District, Beijing Scope: 3,200 m² atrium · 540 luminaires · KNX backbone + DALI-2 zones Delivered: Q2 2025
Brief
SKP-S sits next to the original SKP and is China's top luxury retail revenue benchmark per m². The 2017 lighting (fixed 3500 K halogen + first-gen LED tracks) had three measurable problems shoppers complained about on Xiaohongshu and Weibo in late 2024: tenants like Bottega, Hermès and Loewe were specifying their own 2700 K shop fits that clashed visibly with the 3500 K common areas; brown leather goods at concession edges looked grey; and the 11:00 daylight scene felt "cold and operating-room" in shopper interviews.
Solution at a glance
- CRI 97 / R9 > 90 Phosphor-converted LEDs across the atrium — leather and gold reads accurately
- Tunable 2400–5000 K on every track head — concession boundaries blend with tenant fits
- KNX backbone ties façade, atrium and HVAC interlocks; DALI-2 DT8 drives the luminaires
- Six pre-stored scenes plus astronomical clock (sunrise / morning / midday / golden hour / dusk / late)
Photometric targets vs. measured
| Metric | EN 12464-1 / target | Measured |
|---|---|---|
| Vertical illuminance (merchandise) | 300 lx | 340 lx |
| Cylindrical (face recognition) | 150 lx | 175 lx |
| UGR | <19 | 14 |
| CCT consistency MacAdam | SDCM 3 | SDCM 2 |
| CRI / R9 | ≥90 / ≥50 | 97 / 92 |
Commercial impact (first 90 days)
- Average dwell time in the atrium: +18% (in-store anonymized Wi-Fi data)
- Conversion on ground-floor concessions: +6.4%
- Energy use: −39% vs. baseline halogen + LED hybrid
Gallery
Walkway running the 17:00 "golden hour" scene — 2700 K with 30° narrow spots on featured merchandise.
Escalator core — recessed linear at 12 W/m, tunable 2400–4000 K with grazing optic.
XHLWX 48 V magnetic track — tool-free swap when tenants change concession layout.
Façade wash on a separate KNX line — Casambi for special events.
What we'd do differently next time
A second commissioning week — luxury tenants signed off on day-1 settings, then re-spec'd six months later. Build a second tuning visit into the contract. Also: install one sky-camera per atrium glazing so the auto-CCT scene reacts to real Beijing winter haze, not just the astronomical clock.
Delivered by XHLWX in collaboration with the SKP project team.