Sylvania 22083 F20T12/D

SYLVANIA F20T12/D | 20W 6500K Daylight 2-Foot Linear Fluorescent Preheated Lamp

The Sylvania F20T12/D (21123) is a commercial-grade, high-performance **20W linear preheated fluorescent lamp** engineered for residential, commercial, and task lighting applications requiring high visual acuity. Featuring a standard **G13 Medium Bi-Pin base** and a heavy-duty **1.5-inch diameter (T12 profile)** glass envelope, this 24-inch tube projects a crisp, stark **6500K Daylight** color spectrum. It outputs **480 initial lumens** backed by a standard **76 CRI** color accuracy matrix. Designed for classic preheat and compatible trigger-start circuits, this reliable linear lamp provides a dependable **9,000-hour average rated life**, making it an excellent replacement for compact utility areas, shop lights, and inspection stations.

Crisp Daylight Illumination and Industrial Standard Reliability

Sylvania T12 fluorescent lamps incorporate advanced internal phosphors to sustain optimal light levels over extended usage. Fully compliant with standard **ANSI C78.81-2001** engineering regulations, this 2-foot tube excels in residential or industrial 24-inch luminaire configurations. Emitting a piercing 6500K daylight color profile, it mimics natural midday outdoor lighting, which stimulates alert focus and sharpens contrast. Maintaining an excellent **432 mean lumens** threshold across its lifespan, this long-life bulb resists significant lumen depreciation, providing bright, uniform coverage while remaining cost-effective for commercial facilities.

• Targeted 6500K Visual Performance: Delivers a clean, blue-white light profile that maximizes readability, visibility, and contrast inside workspaces or inspection zones.
• Preheat and Rapid-Start Versatility: Built specifically to function on standard low-wattage preheat lines utilizing independent starters, as well as select multi-lamp trigger-start ballast layouts.
• Rugged T12 Glass Enclosure: Features a robust 1.5-inch diameter physical form factor that provides a wider, more diffused glare-reducing surface output compared to skinnier T8 lighting tubes.
• Extended Operational Longevity: Engineered to provide **9,000 average rated hours** of service based on traditional 3-hour switching routines, lowering standard replacement labor costs.

Technical Specifications

• Brand: Sylvania
• Product Code / NAED: 21123
• Ordering Abbreviation: F20T12/D
• Technology Type: Linear Fluorescent Lamp
• Starting Method Classification: Preheat / Trigger Start
• Wattage: 20W
• Bulb Configuration: T12 Linear Tube (1.50-Inch / 38.1mm Diameter)
• Base Type: G13 (Medium Bi-Pin)
• Initial Lumens: 480 lm (Measured after 100 operational hours)
• Mean Lumens: 432 lm
• Color Temperature: 6500K (Daylight Spectrum)
• Color Rendering Index (CRI): 76
• Average Rated Lifespan: 9,000 Hours
• Maximum Overall Length (MOL): 24 Inches (2 Feet / 610 mm)
• Standard Package Quantity: Shipped in standard factory wholesale packs of 30 lamps per case
• Industry Standards Compliance: ANSI C78.81 - 2001 Technical Specification

Certified Replacement Ballast Pairings

To secure correct electrical currents and safeguard system lifetime integrity, pair this F20T12 lamp with certified ballast gear:

• Advance / Philips: LC1420C-I (Core & Coil Preheat Ballast)
• GE / Current: GE240RS-MV-N (Multi-Voltage Rapid Start Series)
• Halco Lighting Technologies: E120RS/120 (#50108 Electronic 120V)
• Robertson Worldwide: RSW120T12120 (Trigger Start Electronic)

Ballast Operation & burning Cycle Guidelines

• Starter Requirements: When integrated into standard preheat fixtures, this lamp requires an external mechanical starter (such as an FS-2 starter) to pre-warm the internal lamp cathodes before striking the main arc loop.
• Burning Cycle Efficiencies: Stated lifespans are verified using standardized 3-hour switching routines. Running the system on extended, continuous burning cycles yields a proportional, substantial increase in total overall hours of lamp life.
• Initial Burn Period: Approximate initial lumens are measured after a mandatory 100-hour factory burn-in sequence, during which the gas mixture stabilizes completely inside the phosphor-coated tube.

Recommended Commercial Applications

• Under-Cabinet & Task Stations: Perfect for residential kitchens, office cubicles, and craft workshop tables requiring high-contrast, localized lighting.
• Commercial Display Cases: Ideal for highlighting grocery displays, retail showcases, and indoor floral racks that benefit from stark daylight coloration.
• Utility & Storage Closets: Provides dependable, immediate light coverage inside residential laundry rooms, apartment storage corridors, and commercial mechanical closets.