GBK 12V 50W 12V ALR18 57MM BA15D 409348

The Philips Professional GBK 340158/409348 50W 12V Lamp is an industrial-grade, low-voltage tungsten halogen reflector lamp engineered for high-intensity elevator cab ceilings, commercial display accent tracks, and high-end architectural downlight canisters. Delivering 810 initial lumens of crisp 3000K warm white illumination, this heavy-duty ALR18 lamp projects a highly directional 25° narrow flood beam spread yielding a powerful 2,200 center beam candlepower (CBCP). Outfitted with an industry-standard BA15d double-contact bayonet base and an integrated frosted safety glass face lens, it provides a 2,000-hour rated average service life while utilizing a rigid aluminum block reflector shell to isolate the fixture socket from backend thermal loads.

ADL Supply Expert Application & Replacement Guide

The Philips ALR18 GBK series bulb is an established property maintenance standard specified heavily by commercial building facility managers, elevator service technicians, and upscale retail design teams. This heavy-duty module is engineered explicitly to slide into recessed elevator ceiling downlight cavities, high-intensity showcase tracks, and specialized architectural task fixtures where a compact, high-output narrow flood beam pattern (2,200 CBCP) is required.

Critical Elevator Cab Constraints and Reflector Thermodynamics: Unlike standard glass dichroic lamps that channel infrared heat backward into delicate track housing spaces, this model incorporates a rigid **block-aluminum reflector lining**. This structural configuration blocks infrared wavelengths from traveling backward, reflecting 100% of light and thermal output forward away from the lampholder assembly. While this protects deep fixture socket tracks, structural wiring runs, and internal carriage wire bundles from melting, it creates an intense concentration of forward heat. Maintenance crews servicing elevator ceilings must verify that integrated cab ventilation exhaust blowers remain fully operational to safely disperse thermal accumulation. Furthermore, the BA15d base features dual parallel bottom contact plates on a 15mm barrel; verify that socket terminals are un-shunted before twisting the base into place.

Detailed Product Specifications

• Brand: Philips Lighting (Signify Specialist Group)
• Product Series Line: Low-Voltage Aluminum Reflector ALR18 Series
• Philips Order Code Catalog SKU: 34015-8 (Alternative Stock Tracking Code: 340158)
• Manufacturer Nomenclature Model: 50W 12V NFL 25DEG ALR18
• Trade Industry ANSI Identification Code: GBK Certified Standard Match
• UPC Barcode Number (GTIN-12): 046677340156
• Core Technology Class: Low-Voltage Miniature Tungsten-Halogen Reflector
• Operational Wattage: 50 Watts
• Nominal Input Voltage Requirement: 12 Volts AC/DC (Step-down transformer circuit required)
• Initial Luminous Brightness: 810 Lumens
• Center Beam Luminous Intensity: 2,200 Candelas (cd)
• Luminous Efficacy: 16.2 Lumens per Watt (LPW)
• Beam Spread Profile: 25° Narrow Flood (NFL)
• Color Temperature Configuration: 3000K Warm White Halogen Balance
• Color Rendering Index (CRI): 100 Ra (Absolute Light Quality Representation)
• Reflector Envelope Construction: Hard Block-Aluminum Shield Coating (Forward Thermal Passing)
• Front Lens Treatment: Uniformly Frosted Diffusing Safety Cover Glass
• Base Type Configuration: BA15d (Double-Contact Miniature 15mm Bayonet Sleeve)
• Maximum Overall Length (MOL): 2.28" Inches (58.0mm actual)
• Bulb Nominal Diameter (DIA): 2.24" Inches (ALR18 / 57.0mm actual reflector rim width)
• Rated Average Lifespan: 2,000 Hours (Constant Voltage Scale)
• Chassis Burn Position Limit: Universal — Operates reliably in any mounting angle

Operation, Safety & Mounting Compliance

Low-Voltage Transformer and Dimming Controls

This 50-watt capsule operates strictly on low-voltage 12V grids driven by high-quality electronic or magnetic core-and-coil step-down transformers. Check your transformer nameplate under load to confirm total available wattage parameters safely accommodate the intensive 50W continuous load draw. This module is 100% dimmable to low light levels—to prevent filament buzzing or flicker loops across the system, ensure that your wall dimmers are specifically certified for low-voltage lighting control (electronic low-voltage ELV or magnetic low-voltage MLV tracking, matching your transformer's internal circuit framework).

Handling Rules and Casing Maintenance

Never handle the outer glass casing or base plate with bare hands during installation sweeps. Human fingers automatically deposit microscopic alkaline body oils that fuse chemically to the quartz lens during rapid heating cycles. This containment creates localized hot spots, prompting envelope clouding, micro-fracturing, and accelerated pressure breakdown. Installers must execute re-lamping sweeps using clean cotton tech gloves, a microfiber lint-free wipe, or its protective cardboard wrapper sleeve. Meticulously wipe the bulb with isopropyl alcohol if skin tracking occurs. Let the fixture cool down for 15 minutes before servicing components to prevent contact skin burns.

Commercial Equipment Industry Cross-References

• Alternative: 54024 / GBK 50W 12V BA15d Frosted ALR18
• GE Lighting Match: Q50ALR18/FL25 / Order Code 41018
• Eiko Reference: GBK 12V 50W / Order Code 01320

Bulk Commercial Lighting Supply & Project Support

ADL Supply handles volume distribution shipments, multi-pack logistics, and contractor project quotes for procurement teams, schools, and warehouse facilities nationwide.

For specialized contractor pricing tiers, job-site pallet deliveries, or comprehensive submittal documentation, contact our support team directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.