PHILIPS FOCUSLINE 15W 6V | 2900K Halogen | GZ4 Base | Type 13528

Philips 31504-4 (Type 13528) is a high-precision Focusline photo-optic halogen lamp engineered for the demanding requirements of medical, dental, and scientific instrumentation. This 15-watt, 6-volt lamp utilizes a specialized C-6 filament and quartz construction to deliver distortion-free, full-spectrum light with a perfect 100 CRI for absolute color accuracy. Designed for use in microscopes, dental operatory lights, and specialized projection equipment, the Focusline series is trusted for its consistent lumen output and precise beam alignment over its 750-hour rated life. Its compact 35mm profile and GZ4 base ensure a secure fit in high-performance OEM equipment.

Product Overview

The Philips 31504-4 Focusline is a specialized photo-optic halogen source designed for clarity and precision. Unlike standard halogen bulbs, the Focusline series undergoes rigorous manufacturing to ensure exact filament positioning, which is critical for equipment that relies on precise optics and condensers. The 2900K color temperature provides a warm, natural light spectrum that is easy on the eyes during long periods of microscopy or medical procedures. Its quartz envelope allows for high-temperature operation in compact fixtures, while the halogen cycle prevents the bulb from darkening, ensuring maximum light transmission throughout its entire lifecycle.

• Optical Precision: Features the 13528-type flat filament design for optimal light distribution in lenses and reflectors.
• Genuine OEM Replacement: The preferred choice for maintaining the calibration and performance of dental operatory and medical diagnostic equipment.
• High CRI (100): Renders the full color spectrum accurately, a vital requirement for surgical and clinical environments.
• Compact Footprint: 35mm diameter enables integration into small, specialized lamp housings.

Technical Specifications

• Brand: Philips Focusline (Photo-Optic)
• Order Code: 31504-4 (Type 13528)
• Wattage: 15W
• Voltage: 6V
• Base Type: GZ4 (Bi-Pin)
• Color Temperature: 2900K
• Color Rendering Index (CRI): 100
• Filament Type: C-6
• Bulb Diameter: 35mm
• Rated Average Life: 750 Hours
• UPC: 8711500409782

Safety & Handling Instructions

• No Bare Skin: Halogen lamps are sensitive to oils. Do not touch the glass with bare fingers; use a clean cloth or gloves. If touched, clean the bulb with rubbing alcohol.
• Enclosed Fixtures: This lamp operates at high pressure and temperature; it must only be used in fixtures specifically designed for halogen lamps with protective shielding.
• Voltage Management: Ensure your equipment transformer provides a stable 6V output. Operating at even a slightly higher voltage can significantly reduce lamp life.
• Cooling Time: Allow the lamp to cool completely before attempting replacement to avoid skin burns.

Primary Applications

• Medical & Dental: Dental operatory lights, clinical diagnostics, and surgical headlamps.
• Microscopy: Lab-grade microscope illuminators requiring high color accuracy.
• Scientific Instrumentation: Spectrophotometers and precision analysis tools.
• Specialty Projection: Micro-projection and vintage optical equipment.