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
Central atrium walkway, golden-hour scene
Walkway running the 17:00 "golden hour" scene — 2700 K with 30° narrow spots on featured merchandise.
Escalator core with linear cove
Escalator core — recessed linear at 12 W/m, tunable 2400–4000 K with grazing optic.
Ceiling track detail showing magnetic system
XHLWX 48 V magnetic track — tool-free swap when tenants change concession layout.
Exterior façade at dusk
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.
Frequently Asked Questions
How Did the Lighting Retrofit Impact Commercial Performance and Energy Consumption?
In the first 90 days following completion, the atrium recorded an 18% increase in average dwell time based on in-store Wi-Fi tracking and a 6.4% gain in ground-floor concession conversion. Concurrently, overall energy use fell by 39% compared to the previous halogen and LED hybrid baseline.
What Control System Architecture Was Used for the Luminaire Network?
The project deployed a KNX backbone to integrate the façade, atrium, and HVAC interlocks, while DALI-2 DT8 controls individual luminaires across six pre-stored astronomical clock scenes. Additionally, the exterior façade wash runs on an independent KNX line equipped with Casambi for special event control.
How Does the Installation Resolve Color Inconsistencies with Luxury Concession Boundaries?
Every track fixture incorporates tunable white output between 2400 K and 5000 K alongside a high CRI of 97 (R9 > 90) to match the warm 2700 K specifications of luxury tenants. Fixtures are mounted on tool-free XHLWX 48 V magnetic tracks, enabling rapid layout adjustments whenever tenant concessions change.