KL-LED-STZ4 Four-Petal LED Operating Lamp

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 (Jiangsu Keling Medical Appliances Co., Ltd.) 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.

Illuminance at 1 m: 160,000 lux
Colour temperature: 3,000–6,700 K
Colour rendering: Ra ≥ 85
Mounting: Ceiling

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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 (Jiangsu Keling Medical Appliances Co., Ltd.), 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.

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 (Jiangsu Keling Medical Appliances Co., Ltd.) 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.

Key features

Four-Petal (Quad-Lobe) Dome DesignThe 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 mThe 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) ModeA 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 DissipationKeling 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-GlarePrecision-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 BodyThe 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 ConfigurationsAvailable 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

Specifications are subject to change; dimensional tolerances may apply. Contact Keling Medical for the latest datasheet.

KL-LED-STZ4 technical specifications
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

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

Detail sheets

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Frequently asked questions

What is the KL-LED-STZ4 used for?

The Keling KL-LED-STZ4 is a ceiling-mounted LED shadowless operating lamp used to illuminate the surgical field during open and minimally invasive surgical procedures. The KL-LED-STZ4 delivers 160,000 lux at 1 m, making it suitable for general surgery, laparoscopy, orthopedics, cardiovascular surgery, and neurosurgery in hospitals and specialty surgical centres.

What color rendering index does the KL-LED-STZ4 achieve?

The KL-LED-STZ4 has a color rendering index (Ra) between 85 and 100, meaning it reproduces tissue colors very close to natural daylight. This high Ra value allows surgeons to distinguish diseased tissue from healthy tissue reliably under the KL-LED-STZ4's illumination.

Does the KL-LED-STZ4 support minimally invasive surgery?

Yes. The KL-LED-STZ4 includes a dedicated minimally invasive (Endo) mode that reduces output to 10,000 lux at 1 m. This independent mode prevents camera sensor overexposure during laparoscopic and endoscopic procedures while maintaining ambient illumination for the surgical team. The single-dome (KL-LED·STZ4) and double-dome (KL-LED·STZ4/STZ4) configurations both include the Endo mode.

Can hospitals and distributors purchase the KL-LED-STZ4 on an OEM or wholesale basis?

Yes. Keling Medical (Jiangsu Keling Medical Appliances Co., Ltd.) supplies the KL-LED-STZ4 and the full range of Keling surgical lights to hospitals, medical equipment distributors, and OEM partners worldwide. CE-marked configurations are available. Wholesale and OEM inquiries can be directed to Keling Medical at our export team.