Sylvania Quartzline® 58763 (250Q/MC ESM) Halogen Lamp — 250W | 120V Line Voltage | 4,850 Lumens | E11 Miniature Candelabra Base

The Sylvania Quartzline® Professional 58763 (250Q/MC ESM) Lamp is a commercial-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 4,850 initial lumens of bright 2950K studio white illumination, this premium single-ended bulb features an industry-standard ANSI ESM specification tracking profile and utilizes a precision-aligned CC-2V coiled-coil filament array to achieve a flawless color rendering index of 100 CRI. Outfitted with a heavy-duty E11 miniature candelabra screw base and an un-shrouded clear 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 Sylvania ESM 58763 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 CC-2V coiled-coil 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 E11 Candelabra 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 threads into a heavy-duty E11 miniature candelabra socket. Firing this dense 250-watt load inside a tight T4 envelope pushes current lines to a continuous draw of 2.08 Amperes, generating intense localized thermal profiles across the base tracks.

Screw the base threads tightly and smoothly into the socket collar until the center contact button locks fully flush against the receiving pin. Any loose thread seating, carbon pitting, or socket debris along the 11mm thread track will introduce heavy contact resistance, creating an intensive localized thermal feedback loop that will transcend the base's maximum safe 350°C operating threshold, causing catastrophic tracking failures that melt or fuse the internal luminaire socket blocks.

Detailed Product Specifications

• Brand Name: Sylvania (OSRAM Sylvania Display/Optic Specialty Lighting Division)
• Product Series Line: Quartzline® Line-Voltage Single-Ended Quartz Specialty Halogen Family
• Sylvania Factory Product Order Code SKU: 58763
• Official Industry ANSI Equipment Code: ESM
• Manufacturer Description Model Nomenclature: 250Q/MC ESM
• UPC Barcode Number (GTIN-12): 046135587634
• Global Trade Logistics Code (GTIN-13): 0046135587634
• 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
• Continuous Operating Amperage Draw: 2.08 Amperes continuous line current load
• Initial Luminous Brightness: 4,850 Lumens (Post standard factory seasoning burn)
• Systemic Luminous Efficacy: 19.4 Lumens per Watt (LPW)
• Color Temperature Configuration: 2950K Studio White (Clear Transparent Optical High-Purity Casing)
• Color Rendering Index (CRI): 100 Ra (Flawless Continuous Full-Spectrum Energy Distribution)
• Filament Type Geometry Class: CC-2V (Precision Calibrated Rigid Coiled-Coil Segmented Tungsten Filament)
• Base Type Configuration: E11 Miniature Candelabra Base (Solid brass screw threading / 11mm collar width)
• Maximum Base Shell Temperature Limit: 350°C (662°F Maximum Safe Surface Threshold)
• Maximum Bulb Wall Operating Temperature: 900°C (1652°F Outer Chamber Heat Limit)
• Bulb Shape Enclosure Code: T4 Enclosure Shape (0.50" Inch / 12.7mm actual outer quartz glass casing width)
• Maximum Overall Length (MOL): 3.13" Inches (79.5mm actual structural body height face-to-tip)
• Light Center Length (LCL Dimension): 1.62" Inches (41.2mm precision focal alignment height axis center)
• Rated Average Service Lifespan: 2,000 Hours (Calibrated high-reliability performance lifespan target)
• 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 borders mandatory.

Commercial Stage Equipment Industry Cross-References

This premium 250W 120V E11 halogen bulb serves as a direct drop-in replacement or alternative for the following lines:

• GE Lighting Match: GE 43697 Q250CL/MC (ESS) Quartzline ShowBIZ Family
• Philips Lighting Match: Philips 250W 120V Mini-Can T4 Clear / Technical Reference Code 218990
• Ushio Alternative Match: Ushio Q250CL/MC (ESS) Specialty Line / Factory Order Code 1001402
• Global Entertainment Cross Line: Direct replacement globe for various portable theatrical border lights, cyc lights, and downlight spotlights

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.