Osram FLK 575W 120V Professional Stage Halogen Lamp – ANSI FLK | 3100K | 12,800 Lumens | G9.5 Bipin | 1,500 Hours | ETC Source 4 Compatible

The Osram FLK is a 575-watt 120-volt professional stage halogen lamp delivering 12,800 initial lumens at 3100K with CRI 100, CC-8 tungsten filament, and G9.5 bipin base. ANSI FLK certified, LIF Code CP-77, universal burn position, and 1,500-hour rated life make this the industry-standard replacement lamp for ETC Source 4, Altman 360Q, Strand SL Series, L&E AQ61ZM Zoom, and Berkey Colortran 5/50 stage fixtures on 120V circuits. Cross-referenced to Ushio #1002196, GE 88548, and Thorn HX600.

Quick Specs

• Brand: Osram
• ANSI Code: FLK
• LIF Code: CP-77
• Lamp Type: Halogen — Professional Stage & Studio
• Wattage: 575W
• Voltage: 120V AC
• Base Type: G9.5 Bipin
• Color Temperature: 3100K (Warm White)
• CRI: 100
• Initial Lumens: 12,800 lm
• Rated Life: 1,500 hours
• Filament Type: CC-8 Tungsten
• Burn Position: Universal
• Start Type: Instant — full intensity immediately
• Overall Length: 4 inches (102mm)
• Diameter: 0.78 inches (20mm)
• Fixture Requirement: UL-Certified Fixtures Only

Product Overview

The Osram FLK is a 575-watt 120-volt professional stage halogen lamp — the industry-standard replacement lamp for the ETC Source 4 ellipsoidal spotlight and a wide range of professional theatrical and concert lighting fixtures. ANSI FLK certified and LIF Code CP-77, this lamp is specified across the professional entertainment lighting industry and is cross-referenced by Ushio, GE, and Thorn under compatible designations.

The G9.5 bipin base in a stage halogen lamp requires careful ordering — G9.5 is the pin spacing designation, but stage fixtures may specify G9.5, GY9.5, or GX9.5 depending on the specific lampholder design. Verify the exact base type specified by your fixture manufacturer before ordering. The CC-8 tungsten coiled coil filament delivers a compact, bright source suited to the ellipsoidal reflector geometry of fixtures like the ETC Source 4, where precise filament positioning within the lamp produces clean beam cutoffs and crisp gobo projection.

At 3100K, the FLK produces warmer light than 3200K studio-standard lamps — still appropriate for video production when camera white balance is set to tungsten, and visually pleasing for theatrical applications where warm color temperature enhances skin tones and saturated gel colors. CRI 100 full-spectrum halogen output renders all visible wavelengths accurately, ensuring consistent color reproduction through theatrical gels and photographic filters.

The 1,500-hour rated life is based on professional duty cycles appropriate for theatrical use. Lamp replacement frequency will vary by production schedule and fixture usage pattern — stock spare lamps for demanding production schedules.

Why Choose This Product

• ANSI FLK — the professional stage standard at 575W/120V: ANSI FLK is the defined lamp specification for the ETC Source 4 and compatible 575W professional stage ellipsoidal fixtures. Specifying by ANSI code ensures the replacement lamp meets the same electrical and photometric performance parameters as the original equipment specification.
• ETC Source 4 compatible: The most widely deployed professional ellipsoidal spotlight in the world is designed around the FLK lamp specification — making the Osram FLK a direct replacement in an enormous installed base of theatrical and concert lighting equipment.
• 3100K warm white — flattering theatrical color temperature: Warmer than studio-standard 3200K, the 3100K color temperature is preferred by theatrical designers for its warm, flattering rendering of human skin tones and its behavior through saturated theatrical gels.
• CRI 100 — accurate color through gels and filters: Full-spectrum halogen output ensures consistent, predictable color rendering through theatrical color gels, photographic filters, and optical elements.
• CC-8 tungsten filament — precise beam geometry: The coiled coil filament provides a compact, concentrated source appropriate for the tight reflector geometry of ellipsoidal spotlights where accurate filament positioning determines beam quality and gobo sharpness.
• Universal burn position: Operates in any fixture orientation without affecting lamp performance or rated life.
• Instant full intensity: No warm-up — full 12,800 lm output immediately at switch-on. Required for live production applications where cue-accurate intensity is a technical requirement.
• 1,500-hour rated life: Standard professional duty cycle rating for 575W stage halogen — maintain adequate lamp inventory for touring and rep productions.

Technical Specifications

Dimensions

Cross-Reference — Compatible Lamp Designations

The Osram FLK is cross-referenced to the following equivalent lamp designations from other manufacturers. Always verify ANSI code, wattage, voltage, and base type match your fixture specification before substituting.

Cross-reference information is provided for convenience only. Always verify compatibility with your fixture manufacturer before purchase.

Compatible Fixtures

The ANSI FLK lamp is the specified replacement lamp for the following professional stage fixtures. Confirm lamp specification with your fixture manufacturer’s documentation before ordering.

Fixture compatibility is provided for reference only. Always verify the lamp specification with your fixture manufacturer’s documentation before purchase. We assume no liability for incorrect cross-reference matches.

Applications

The Osram FLK 575W is the standard replacement lamp for professional entertainment lighting applications on 120V circuits:

• Theatrical stage lighting – The FLK is the primary lamp specification for professional theatrical ellipsoidal spotlights including the ETC Source 4. Used in theatres, performance spaces, and educational stage facilities for focused general illumination, special effects, and gobo projection.
• Concert and touring lighting – Standard stock lamp for 575W ellipsoidal and profile spotlights in touring production rigs. Universal burn position and consistent photometric output support demanding touring production schedules.
• Television and studio production – Stage fixtures fitted with FLK lamps are used in television studio lighting rigs where 3100K tungsten-balanced output is required for camera-balanced illumination on talent and performance sets.
• Event and corporate production – 575W FLK ellipsoidal fixtures are standard inventory in professional event lighting rental companies and corporate AV production facilities.
• Educational theatre programs – Standard teaching lamp for university and conservatory theatre programs where ETC Source 4 and equivalent ellipsoidal fixtures are the curriculum standard.

Replacing Your Current Stage Halogen Lamp?

Stage halogen lamps are safety-critical specification replacements. Confirm all of the following before ordering:

• ANSI code — FLK: Verify your fixture specifies ANSI FLK. FLK is specific to 575W/120V with G9.5 base — it is not interchangeable with FEL (1000W/120V), HPL (575W/120V different LCL), or other 575W designations. The ETC Source 4 specifically specifies FLK.
• Voltage — 120V: This lamp operates at 120V. Verify your fixture is on a 120V circuit. Do not install in 240V fixtures.
• Base type — G9.5 bipin: Stage fixtures specify G9.5, GY9.5, or GX9.5 bases — confirm the exact base type with your fixture manufacturer’s lamp specification documentation. Pin spacing differences between these designations make them physically non-interchangeable in some lampholders.
• FLK vs HPL distinction: The ETC Source 4 can accept both FLK and HPL lamps depending on the fixture model variant — FLK and HPL have different LCL (Light Center Length) values and produce different beam characteristics in the same fixture. Confirm which lamp your specific Source 4 variant requires.
• Burn position: Universal — no orientation restriction.
• Do not touch the bulb with bare hands: Skin oils cause hot spots leading to premature failure. Use thermal-rated gloves or a lint-free cloth. Clean with isopropyl alcohol if touched accidentally.
• Cool-down before lamp change: Allow at least 15 minutes cool-down after the fixture is switched off. Operational surface temperature exceeds 400°C — use thermal-rated gloves for handling.

Ordering Information

• Brand: Osram
• ANSI Code: FLK
• LIF Code: CP-77
• Lamp Type: 575W 120V Professional Stage Halogen
• Base: G9.5 Bipin
• Case quantities and bulk pricing: Contact ADL Supply for volume orders.

Compliance and Certifications

• ANSI FLK Certified: Yes
• UL Listed: Yes
• RoHS Compliant: Yes
• Verify Prop 65 warning requirements with manufacturer specification sheet.

Safety and Handling Guidelines

• Operational surface temperature exceeds 400°C: Use thermal-rated gloves for all handling and lamp replacement operations. Never touch the lamp housing while operating or immediately after switch-off.
• 15-minute cool-down required: Allow at least 15 minutes after switch-off before attempting lamp replacement.
• No bare hands on the bulb envelope: Skin oils on the quartz envelope cause hot spots leading to premature failure. Use thermal-rated gloves or a lint-free cloth. Clean with isopropyl alcohol if touched accidentally.
• UL-certified fixtures only: Install only in UL-certified fixtures rated for ANSI FLK 575W/120V halogen operation.
• Follow your fixture manufacturer’s service documentation for lamp replacement procedures.

ADL Supply recommends confirming all applicable compliance data with the Osram official product data sheet prior to specification or installation.