SYLVANIA 58754 | 250Q/DC 250W 120V Quartz-Halogen Specialty Projection & Photo-Optic Lamp

The Sylvania 58754 (250Q/DC) is a commercial-grade, high-intensity 250W quartz-halogen specialty lamp engineered for precision optical projection networks, scientific microscopy configurations, surgical dental illumination, and industrial inspection instrumentation. Outfitted with a heavy-duty **BA15d double-contact bayonet base** (commonly paired with specialized DC/bi-pin adapter blocks) and a sub-miniature **T4 clear quartz glass profile**, this high-output module utilizes high-purity halogen regenerative cycle dynamics to deliver a brilliant, shadow-free point-source beam. Engineered to strict OEM photo-optic alignment tolerances, it maintains an elite **100 CRI** color accuracy rating and stable color temperature throughout its operational life. Built for enclosed, fan-cooled specialty luminaires, this premium German or American-manufactured light engine ensures the uncompromised beam uniformity required by medical laboratories and technical imaging systems worldwide.

Precision Filament Alignment and Halogen Regenerative Chemistry

Sylvania Photo-Optic Specialty lamps solve the tight tolerance restrictions of technical imaging setups by mounting a highly compressed tungsten filament matrix inside a premium quartz glass housing. Operating under high internal pressures, the internal halogen gas compound establishes a continuous chemical cycle that pulls evaporated tungsten particles off the inner glass walls and deposits them directly back onto the burning filament core. This regenerative loop prevents the early glass blackened solarization typical of standard incandescent bulbs, ensuring completely stable lumen output and uncompromised color rendering index consistency across its lifecycle. Paired with a precision-molded base assembly, it keeps the filament perfectly centered within the focal planes of optical mirrors, condensers, and microscope lens systems.

• OEM Micro-Tolerance Positioning: Designed to line up flawlessly inside complex projection tracks, eliminating optical drift and beam distortion across laboratory equipment.
• True-to-Life Color Accuracy (100 CRI): Emits a rich, continuous full-spectrum lighting path that yields absolute color fidelity, vital for accurate medical evaluations and industrial quality screening.
• High-Density Quartz Glass Envelope: Built to withstand elevated operational temperatures without structural warping or gas seal breakdown, maximizing safety inside compact fixture frames.
• Advanced Point-Source Illumination: Highly focused filament geometry allows projection lenses to efficiently collect, redirect, and zoom the light beam onto targeted inspection points.

Comprehensive Technical Specifications

• Brand Name: OSRAM Sylvania
• Product Family / Series: Photo-Optic Specialty Halogen Series
• Ordering NAED Number / SKU: 58754
• Technical Abbreviation Designation Code: 250Q/DC
• Technology Class: High-Performance Quartz-Halogen
• Bulb Shape Configuration: T4 Clear Miniature Profile
• Nominal Wattage: 250W
• Nominal Voltage Rating: 120V Line Current
• Base Type Configuration: BA15d (Double-Contact Bayonet / Compatible with specific specialty bi-pin conversion assemblies)
• Color Rendering Index (CRI): 100 (Full-Spectrum Chromaticity)
• Filament Structural Profile: CC-2V High-Density Coiled Filament
• Light Center Length (LCL): Approx. 1.25 Inches (31.8 mm)
• Maximum Overall Length (MOL): Approx. 3.15 Inches (80 mm)
• Bulb Envelope Diameter (DIA): 0.51 Inches (13 mm)
• Fixture Certification Code: Approved for Enclosed, Fan-Cooled Halogen Luminaires Only

System Integration, Enclosure Rules & Operational Safety

• Mandatory Enclosed Fixture Notice: Due to extreme gas pressures and high internal operating temperatures, this quartz-halogen module **must exclusively be operated inside enclosed, defensively shielded luminaires**. Host equipment must feature safety-tested tracking paths and protective lenses capable of containing hot quartz fragments in the rare event of an arc burst or structural filament shatter.
• Strict Quartz Handling Protocol: **Never touch the clear quartz glass envelope with bare fingers.** The natural oils on human skin leave behind microscopic residue films that create localized thermal bottlenecks during operation. This localized stress causes early glass devitrification, micro-cracking, and dramatic envelope failure. Always hold the lamp using the protective foam wrapper, clean lint-free gloves, or a dry microfiber cloth during installation. If accidental skin contact occurs, wipe the glass thoroughly with denatured alcohol and let it dry before ignition.
• Thermal Cycling & Cooling Requirements: This 250-watt halogen cell generates rapid, high-temperature thermal loads. Ensure that internal equipment cooling fans, heat sinks, and air channels are free from blockages or dust layer insulation. Always shut down primary line power and allow the system to cool down completely for at least 15 minutes before opening housing brackets to complete a maintenance replacement cycle.
• Electrical Compatibility Warning: This module is rated for direct **120V electrical circuits**. Running this lamp on incorrect low-voltage transformers (such as 12V or 24V medical lines) or non-regulated power feeds will immediately cause structural failure or insufficient arc initiation. Double-check your equipment's manual and active terminal input settings prior to installation.

Recommended Professional & Commercial Applications

• Professional Projection Equipment: Excellent replacement light engine for commercial slide projectors, film overhead arrays, microfiche readers, and vintage theater systems.
• Medical, Dental & Laboratory Instruments: Ideal choice for diagnostic surgical overhead lamps, dental curing lights, endoscopic light guide units, and clinical test instrumentation.
• Scientific Microscopy Lighting: Engineered to provide uniform, full-spectrum illumination for high-magnification compound microscopes and laboratory materials analysis.
• Industrial Inspection & Photo-Optics: Perfect for automated machine-vision arrays, blueprint optical scanners, cleanroom chip-sorting lines, and studio photo-optic systems.