Osram 64642 HLX FDV Xenophot 150W 24V G6.35 Bi-Pin T4 Halogen Lamp — NAED 54264

The Osram 64642 HLX is a single-ended, low-voltage Xenophot tungsten halogen lamp built for high-precision display optic, medical fiber optic, surgical lighting, and microscopy applications. Its xenon gas fill delivers up to 10% greater luminous efficiency compared to standard halogen lamps of the same wattage. With a perfect CRI of 100, a 3,450K color temperature, 5,000 initial lumens, and a 300-hour rated life, it provides consistent, true-to-life illumination in demanding professional and scientific environments.

Specifications

• Bulb Type: T4 Single-Ended Halogen (Xenophot HLX)
• ANSI Code: FDV
• Osram Order Code: 64642 HLX
• NAED / Sylvania Code: 54264
• Osram EAN / Product Code: 4050300012025
• LIF Code: M/184
• Wattage: 150W
• Voltage: 24V (Low Voltage)
• Base Type: G6.35 Bi-Pin (2-Pin Glass)
• Initial Lumens: 5,000 lm
• Color Temperature: 3,450K (Warm White)
• Color Rendering Index (CRI): 100 (Perfect color accuracy)
• Average Rated Life: 300 Hours
• Filament Design: C-BAR-6 (Single Coil Flat/Oval Transverse)
• Bulb Finish: Clear
• Max Overall Length (MOL): 50.0 mm (1.95 in)
• Light Center Length (LCL): 31.7 mm ±0.3 mm (1.25 in)
• Bulb Diameter: 11.5 mm
• Burn Position: s90 — Vertical Base Down to Horizontal Only
• Dimmable: Yes
• Fixture Requirement: Approved Enclosed Halogen Fixtures Only

FDV vs FCS — Know Which Lamp You Need

Osram offers two 150W 24V G6.35 Xenophot lamps that are commonly confused:

• 64642 HLX (ANSI FDV, this lamp): 5,000 lumens — 300-hour rated life — optimized for precision display and medical optic applications.
• 64640 HLX (ANSI FCS): 6,000 lumens — 50-hour rated life — brighter output at the cost of a significantly shorter lifespan, typically used in stage and entertainment lighting.

Always verify the ANSI code stamped on your existing lamp or listed in your equipment's manual before ordering to ensure correct replacement.

What Makes Xenophot (HLX) Different?

Standard halogen lamps use krypton as the filling gas. Osram's Xenophot lamps substitute xenon, which has superior thermal conductivity. This allows the filament to operate more efficiently, producing up to 10% more lumens per watt at the same power consumption. Xenophot lamps are identified in Osram's catalog by the prefix HLX, distinguishing them from standard halogen (HL) versions. They are also dimmable, offering additional flexibility in light-sensitive applications.

Compatible Applications

• Microscopy & Laboratory Instruments
• Medical & Surgical Fiber Optic Illuminators
• Dental Examination & Operating Lights
• Endoscopy & Ophthalmic Equipment
• 35mm Slide & Film Projectors
• Overhead & Microfilm Projectors
• Stage, Studio & Display Lighting
• X-Ray Machine Collimators

Cross-Reference Part Numbers

This lamp is interchangeable with equipment specifying the following part numbers:

• Osram / Sylvania: 64642 HLX / NAED 54264
• Eiko: FDV
• Ushio: 1000424 / JCV24V-150W
• Philips: 13163
• GE / Tungsram: Q150T4/24V
• Bulbrite: 761155

Important Safety & Installation Notes

• Burn Position is Critical: This lamp is rated s90 — it must be operated vertical base-down to horizontal only. Operating outside this range will cause premature failure and may void any warranty.
• Enclosed Fixtures Only: Must be used exclusively in approved, fully enclosed halogen fixtures. Never use in open or unshielded housings.
• No Bare Hands on the Bulb: Never touch the quartz envelope with bare skin. Oils from your fingers create hot spots that lead to early failure or lamp burst. Use clean gloves or a lint-free cloth during installation.
• Precision LCL Matters: The Light Center Length (31.7 mm ±0.3 mm) is tightly specified. Equipment using this lamp relies on the filament sitting at an exact focal point — using an incorrectly sized replacement will degrade optical performance.
• Extreme Heat Warning: This lamp runs at very high temperatures. Never touch when lit or recently switched off. Keep clear of combustibles including paper, plastics, and cloth.
• Eye Safety: Do not look directly at the operating lamp. Intense visible and UV output can cause serious eye injury.
• Do Not Exceed Rated Voltage: Operating above 24V significantly shortens lamp life. Verify your transformer or power supply output before installation.