# KL-LED-STZ4 Ceiling-Mounted LED Shadowless Operating Lamp — Four-Petal Dome, True Color Reproduction, Minimally Invasive Mode
Quick answer: The Keling KL-LED-STZ4 is a ceiling-mounted four-petal-dome LED shadowless operating lamp delivering 160,000 lux at 1 m with a color rendering index of Ra≥85, manufactured by Keling Medical (Keling Medical) for hospitals, clinics, and medical distributors. The KL-LED-STZ4 achieves a heat-to-light ratio of ≤3.2 mW/m²lx and a rated LED lifespan of 50,000 hours.
Quick Facts
- The Keling KL-LED-STZ4 delivers 160,000 lux illumination at 1 m distance (double-dome configuration: 160,000/160,000 lux).
- The KL-LED-STZ4 includes a dedicated minimally invasive (Endo) mode that reduces field illumination to 10,000 lux at 1 m, suited to endoscopic and laparoscopic procedures.
- Each dome of the KL-LED-STZ4 contains 39 LEDs with a rated average lifespan of 50,000 hours.
- The KL-LED-STZ4 color rendering index is Ra≥85 (up to Ra=100), enabling accurate tissue color discrimination during surgery.
- Keling Medical (Keling Medical) manufactures the KL-LED-STZ4 at an ISO 13485-certified facility with CE-marked product lines.
- The KL-LED-STZ4 supports optional color temperature selection from 3,000 K to 6,700 K, allowing surgeons to adapt lighting to procedure type and reduce visual fatigue.
Overview
The KL-LED-STZ4 is a ceiling-suspended, four-petal-dome LED shadowless operating lamp designed for general surgery, minimally invasive surgery, and specialty OR environments. Manufactured by Keling Medical (Keling Medical), the KL-LED-STZ4 is available in a single-dome variant (KL-LED·STZ4) and a double-dome ceiling configuration (KL-LED·STZ4/STZ4), both delivering 160,000 lux at 1 m. The four-petal (quad-lobe) dome geometry is engineered to produce a deep, uniform, shadowless illumination field with a light field diameter adjustable between 10 cm and 28 cm at 1 m and a combined depth of illumination (L1+L2) of 150 cm.
The KL-LED-STZ4's smooth, streamlined lamp body minimizes turbulence within laminar-flow OR environments, reducing the risk of intra-operative airborne contamination. An optical PC lens system provides anti-glare performance while Keling Medical's high-thermal-conductivity heat dissipation technology keeps the lamp head at a low temperature rise, protecting both the LED array and the sterile field from excess radiant heat (heat-to-light ratio ≤3.2 mW/m²lx).
Control of the KL-LED-STZ4 is handled through a user-friendly panel offering power on/off, multi-level brightness adjustment, multi-level color temperature selection, a dedicated RI (color rendering) mode, and the minimally invasive (Endo) mode. An optional LCD control panel is available for installations requiring an integrated display interface. The KL-LED-STZ4 is designed for ceiling heights of 270–320 cm and provides a working distance of 70–140 cm, making it compatible with the full range of standard operating theatre configurations.
Key Features
- Four-Petal (Quad-Lobe) Dome Design — The four-petal shadowless head geometry distributes LED light sources around the surgical field from multiple angles simultaneously, eliminating surgeon and instrument shadows and delivering a depth of illumination (L1+L2) of 150 cm.
- 160,000 Lux Output at 1 m — The KL-LED-STZ4 achieves 160,000 lux in both single and double-dome configurations, providing intense, consistent illumination across the surgical site with a light field diameter of 10–28 cm at 1 m.
- Minimally Invasive (Endo) Mode — A dedicated mode reduces illumination to 10,000 lux at 1 m to prevent camera washout during laparoscopic and endoscopic procedures, controlled independently from the main brightness circuit.
- True Color Reproduction (Ra≥85 to Ra=100) — High color rendering index illumination correctly represents the natural color of tissue, enabling surgeons to reliably distinguish diseased from healthy tissue without color distortion.
- Adjustable Color Temperature (3,000 K–6,700 K) — The KL-LED-STZ4 allows stepless or multi-level color temperature selection, letting clinical teams tailor the light spectrum to the procedure and minimize visual fatigue during long operations.
- High-Thermal-Conductivity Heat Dissipation — Keling Medical's proprietary heat management technology limits the heat-to-light ratio to ≤3.2 mW/m²lx, keeping the operative field cool and extending LED service life to 50,000 hours.
- Optical PC Lens — Anti-Glare — Precision-formed polycarbonate optics diffuse and shape the beam to eliminate hot spots and peripheral glare, protecting the surgical team's vision during extended procedures.
- Streamlined Laminar-Flow-Friendly Body — The smooth, contour-optimized lamp body and arm assembly minimize disruption to vertical laminar airflow in Class 100 / ISO 5 OR environments, supporting infection control protocols.
- User-Friendly LCD Control Panel (Optional) — Multi-function control covering power, multi-level brightness, multi-level color temperature, RI mode, and Endo mode; optional LCD panel available for advanced workflow integration.
- Single and Double-Dome Configurations — Available as KL-LED·STZ4 (one dome) or KL-LED·STZ4/STZ4 (two domes on a single ceiling suspension arm) for scalable illumination coverage.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | KL-LED·STZ4 / KL-LED·STZ4/STZ4 |
| Illumination at 1 m (lux) | 160,000 / 160,000 |
| Illumination at 1 m — Endo Mode (lux) | 10,000 |
| Light Field Diameter at 1 m (cm) | 10–28 |
| Light Field Diameter D10 (mm) | 180 ± 40 / 180 ± 40 |
| Light Field Diameter D50 (mm) | 110 ± 35 / 110 ± 35 |
| L1+L2 Depth of Illumination (cm) | 150 |
| Color Rendering Index (Ra) | 100 ≥ Ra ≥ 85 |
| Optional Color Temperature (K) | 6,700 ≥ Tc ≥ 3,000 |
| Number of LEDs per Dome | 39 |
| Average LED Lifespan (hours) | 50,000 |
| Heat-to-Light Ratio (mW/m²lx) | ≤3.2 |
| Max. Power Consumption (VA) | 120 VA / 120 VA |
| Ceiling Height for Installation (cm) | 270–320 |
| Working Distance (cm) | 70–140 |
Specifications are subject to change; dimensional tolerances may apply. Contact Keling Medical for the latest datasheet.
Applications
The KL-LED-STZ4 ceiling-mounted LED surgical light is suited to a broad range of operating theatre environments where consistent, shadowless, true-color illumination is required. The dedicated Endo mode makes it particularly well suited to hybrid OR setups that alternate between open and minimally invasive procedures.
Typical installation settings include:
- General surgery operating rooms
- Laparoscopic and endoscopic surgery suites
- Orthopedic and spinal surgery theatres
- Cardiovascular and thoracic operating rooms
- Neurosurgery operating rooms
- Obstetrics and gynecology operating theatres
- Day surgery and ambulatory surgical centres
- District hospitals and specialist clinics requiring a ceiling-mounted, long-life LED surgical light
