GE 43697 (Q250CL/DC-120) Single-Ended T4 Halogen Lamp — 250W | 120V Line Voltage | 5,000 Lumens | BA15d Double Contact Bayonet Base

The GE 43697 (Q250CL/DC-120) Lamp is a professional-grade, high-intensity line-voltage tungsten halogen capsule engineered exclusively for theatrical stage border lights, studio fresnels, architectural profile spots, specialized medical diagnostic instruments, and commercial display optical systems. Delivering 5,000 initial lumens of bright 2950K warm white illumination, this premium single-ended bulb features a high system efficacy of 20 LPW and operates at a flawless color rendering index of 100 CRI. Outfitted with a heavy-duty BA15d double contact bayonet base and a clear, high-transmission T4 quartz glass envelope, it ensures perfect optical focal positioning across its 2,000-hour rated average service life.

ADL Supply Expert Application & Replacement Guide

The GE 43697 high-output halogen capsule is an established entertainment and commercial architectural maintenance baseline specified universally across television broadcast studios, theatrical stage borders, concert wash strips, and commercial retail accent tracks. Utilizing a high-purity clear quartz tubular capsule surrounding an expertly engineered tungsten filament array, this lamp projects a continuous, uninterrupted full-spectrum light beam. This allows directors of photography, camera technicians, and stage lighting gaffers to capture absolute color fidelity, natural textures, and accurate skin tones without dealing with the visual color rendering drops or frequency gaps common in alternative solid-state lighting platforms.

Critical 120V Line Voltage Parameters and Mechanical BA15d Bayonet Seating Controls: Field contractors and stage technicians executing routine fixture re-lamping sweeps must analyze track parameter boundaries closely prior to checkout: this capsule operates natively on raw 120V line voltage circuits and locks securely into a double contact bayonet socket. Firing this dense 250-watt load inside a tight T4 envelope generates intense localized thermal profiles across the base tracks.

Push and twist the bayonet base firmly into the socket track until the dual locking pins seat fully flush and click into position. Any loose seating, carbon pitting, or socket debris along the BA15d socket contacts will introduce heavy contact resistance, creating an intensive localized thermal feedback loop that will transcend safe operating thresholds, causing catastrophic tracking failures that melt or fuse the internal luminaire socket blocks.

Detailed Product Specifications

• Brand Name: GE Lighting (Current / Quartzline® Specialty Halogen Family)
• Product Series Line: Single-Ended T4 Halogen Lamps
• GE Factory Product Order Code / SKU: 43697
• Manufacturer Description Model Nomenclature: Q250CL/DC-120
• UPC Barcode Number (GTIN-12): 043168436977
• Core Technology Class: Thermal Incandescent — High-Temperature Tungsten Halogen Capsule
• Primary Control Requirement: Direct Unballasted Line Voltage (120V Mainline Branch Input)
• Operational Power Draw: 250 Watts
• Nominal System Operating Voltage: 120 Volts AC/DC Line Voltage Baseline
• Initial Luminous Brightness: 5,000 Lumens (Post standard factory seasoning burn)
• Systemic Luminous Efficacy: 20 LPW (Lumens per Watt)
• Color Temperature Configuration: 2950 K Warm White (Clear Transparent Optical Casing)
• Color Rendering Index (CRI): 100 CRI (Flawless Continuous Full-Spectrum Energy Distribution)
• Base Type Configuration: BA15d (Double Contact Bayonet Base / Twist-Lock Interface)
• Bulb Shape Enclosure Code: T4 Enclosure Shape (0.5 Inch / 12.7mm outer quartz glass casing width)
• Maximum Overall Length (MOL): 3 Inches (76.2mm actual body height face-to-tip)
• Rated Average Service Lifespan: 2,000 Hours (Calibrated high-reliability performance lifespan target)
• Dimmable Status: Yes (Fully dimmable down line circuit tracks)
• Chassis Burn Position Limit: Universal — Operates reliably at any horizontal, vertical, or tilted mounting angle
• Fixture Safety Rating: Suitably Enclosed Halogen Luminaires Only Mandatory (Strict fragmentation containment control)

Operation, Safety & Mounting Compliance

High-Temperature Regenerative Halogen Halide Cycle Controls

This halogen lamp operates via an internal chemical loop where vaporized tungsten particles bond with halogen gas molecules inside the heated chamber. This compound cycles back onto the burning filament tracks, redepositing the tungsten to preserve filament mass. For this cycle to work cleanly and prevent wall-blackening, the inner envelope must continuously transcend a high temperature threshold exceeding 250°C, making proper convective venting inside showcase track cylinders or theatrical fixtures mandatory.

Commercial Stage Equipment Industry Cross-References

This premium 250W 120V BA15d halogen bulb serves as a direct drop-in replacement or alternative for the following lines:

• Osram Sylvania Match: Osram 58852 Q250CL/DC 120V T4 Clear Double Contact Bayonet
• Philips Lighting Match: Philips 250W 120V T4 Clear BA15d / Technical Reference Code
• Ushio Alternative Match: Ushio Q250CL/DC (120V) Specialty Line / Factory Order Code
• Global Entertainment Cross Line: Direct replacement globe for various portable stage lights, specialized projectors, and studio borders

Bulk Commercial Lighting Supply & Project Support

ADL Supply delivers commercial-volume logistical fulfillment, tiered commercial contractor discounting strategies, and full pallet project quoting options to electrical accounts across the United States.

For formal wholesale inquiries, volume pricing modifications, or manufacturer spec sheet documentation, reach our commercial branch directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.