Philips Advance 14473 (LI501-H4) High Pressure Sodium Ignitor — 150W–400W | 120V / 277V Multi-Voltage | 105°C Max Case Temperature

The Philips Advance LI501-H4 Gaseous Discharge Ignitor is a heavy-duty, commercial-grade solid-state electronic starting mechanism engineered to drive high pressure sodium (HPS) systems ranging from 150 watts up to 400 watts. Operating natively as an auxiliary tracking component for magnetic circuit assemblies, this high-performance module delivers the intensive high-voltage cold starting ignition pulse necessary to strike an electrical discharge arc inside standard S50, S51, S56, S66, and S67 HPS lamps. Encased in a rugged, moisture-resistant black round case rated for continuous thermal safety parameters up to 105°C, this USA-assembled component includes a factory-matched CC-125 mounting clamp to ensure a secure, vibration-resistant retrofit installation within industrial downlights and outdoor area luminaires.

ADL Supply Expert Application & Replacement Guide

The Philips Advance LI501-H4 electronic ignition capsule is an established industrial lighting standard specified universally across municipal roadway layouts, public parking terminals, warehouse high-bay tracks, and heavy industrial distribution hubs. High pressure sodium systems rely fundamentally on an auxiliary ignitor circuit to bridge the cold internal gas gaps of the bulb; if this starting element suffers degradation, the lamp will fail to strike even if your magnetic core ballast tracks and sodium lamps are in flawless working condition. By retrofitting this premium module onto your pre-existing infrastructure, maintenance divisions can secure reliable starting paths while optimizing system performance across extended commercial operations.

Critical 2-Foot Remote Mounting Restrictions and 4 kV High-Voltage Ignition Striking: Facilities engineers and licensed electricians executing routine luminaire repairs must evaluate installation wiring layouts closely prior to checking out: the maximum physical remote wire mounting distance from this igniter casing to the lampholder socket terminals cannot exceed 2 feet. Firing a cold sodium gas column requires an intense **3,000V to 4,000V (3.0 kV to 4.0 kV) high-voltage strike pulse from the internal solid-state igniter board**.

Extending the load lines beyond this 2-foot boundary introduces high systemic circuit line capacitance drops that weaken the ignition pulse energy, prompting chronic striking failure. Ensure your wire nuts and connection blocks are locked down tightly according to the ballast casing schematic. Loose connection terminals will trigger high-voltage creeping arc-overs, creating catastrophic track short-circuits.

Detailed Product Specifications

• Brand Name: Philips Advance (Signify Corporate Division / HID Component Portfolio)
• Product Series Line: Electronic HID Ignitor Component Series
• Philips Advance Factory Product Order Code SKU: LI501-H4 (Corrected unified model key)
• Manufacturer Description Model Nomenclature: LI501H4
• UPC Barcode Number (GTIN-12): 781087071663
• Core Technology Class: Solid-State Electronic Pulse-Start HID Ignitor Module
• Primary Control Requirement: Single 150W, 200W, 250W, 310W, or 400W High Pressure Sodium Load
• Target System ANSI Specification Sync: S50, S51, S56, S66, and S67 Operational Enclosures
• Nominal Operational Input Voltages: Dual-Tap 120V / 277V AC Mainline Branch Matching
• Line Current Frequency Threshold: 60 Hz
• Ignition Pulse Peak Strike Capacity: 3.0 Kilovolts Minimum to 4.0 Kilovolts Maximum (3-4 kV Striking Spike)
• Maximum Remote Mounting Distance Constraint: Up to 2 feet maximum structural lead length to lampholder socket
• Maximum Allowable Shell Temperature (Tc): 105°C (221°F Maximum Safety Surface Case Threshold)
• Minimum Operating Ambient Starting Temperature: -40°C / -40°F Arctic Temperature Performance Baseline
• Enclosure Casing Material: Premium Heavy-Gauge Cylindrical Moisture-Resistant Resin (Black Round Case)
• Mounting Hardware Integration: CC-125 Heavy-Duty Galvanized Steel Tension Compression Clamp (Included)
• Compliance Certifications: UL Recognized (File E42222), CSA Certified, RoHS Compliant, ANSI C82.4 Standard Matching
• Manufacturing Assembly Location: High-Quality Precision Craftsmanship Assembled in the USA

Operation, Safety & Mounting Compliance

Solid-State Low-Frequency Circuit Safety Isolation

This electronic component interfaces with standard high-reactance autotransformer (HX-HPF) magnetic core ballast networks. Upon line activation, the internal solid-state circuitry monitors circuit conditions to inject high-voltage strikes only when the gaseous track resides in a cold state. This automated synchronization cuts unnecessary stress down the electrical lines, protecting adjacent ballast components from experiencing thermal runway failures during extended operation cycles.

Commercial Equipment Industry Cross-References

This premium 150W–400W HPS electronic ignitor serves as a direct drop-in replacement or alternative for the following models:

• Sylvania alternative: HPS-IGN-150-400W / Universal High Pressure Sodium Ignitor Series
• GE Lighting Match: HPS400-IGN / Heavy-Duty 150W–400W Magnetic Auxiliary Cross
• Universal Triad Reference: IGN501B / High-Performance Electronic HID Replacement Module

Bulk Commercial Lighting Supply & Project Support

ADL Supply delivers commercial-volume logistical fulfillment, tiered commercial contractor discounting strategies, and full pallet project quoting options to electrical accounts across the United States.

For formal wholesale inquiries, volume pricing modifications, or manufacturer spec sheet documentation, reach our commercial branch directly at 1-800-235-3489. We are your commercial supply partners as an authorized wholesale Lighting Distributor In Doral, Florida.