Philips C150S55/Alto E39 150W HPS Lamp

Philips 368746 C150S55/ALTO — 150W High Pressure Sodium Lamp, E39 Mogul Base

The Philips 368746 C150S55/ALTO is a 150-watt Ceramalux ALTO High Pressure Sodium (HPS) lamp from Philips Lighting, designed for outdoor area lighting, street lighting, and industrial high-bay applications. With an E39 Mogul Screw base, ED23.5 bulb shape, ANSI code S55, 55V arc tube operating voltage, and universal burn position, this lamp delivers 16,000 initial lumens and a 24,000-hour rated life. The ALTO designation indicates reduced mercury content. Verify wattage, voltage, ANSI code, base type, and ballast compatibility before ordering — HPS lamps require an HPS-rated ballast and ignitor.

Technical Specifications

Product Overview

The Philips 368746 C150S55/ALTO is a professional-grade HPS replacement lamp engineered for outdoor and industrial lighting. At 150 watts, it delivers 16,000 initial lumens — strong efficacy for street, parking, and perimeter lighting as well as warehouse and industrial high-bay fixtures. The warm amber 2100K output is characteristic of High Pressure Sodium technology and is well suited for applications where visibility and energy efficiency take priority over color accuracy.

The ED23.5 bulb shape and E39 Mogul Screw base make this a direct replacement in fixtures previously housing a standard 150W HPS lamp with ANSI code S55. Arc tube operating voltage is 55V — confirm your ballast is rated for this voltage before ordering. Universal burn position allows installation in any orientation. Maximum overall length is 7.75" with a 2.94" bulb diameter — verify fixture clearance before ordering. The ALTO designation indicates this lamp contains reduced mercury content compared to standard HPS lamps.

Not recommended for: retail displays, color-critical inspection environments, sports venues, or any application requiring CRI above 21.

Compatible Applications

• Outdoor area and street lighting — Roadways, parking lots, municipal streetlights, and perimeter security lighting.
• Industrial and commercial high-bay — Warehouses, manufacturing facilities, and large indoor/outdoor commercial fixtures.
• Retrofit and maintenance replacement — Direct replacement for existing 150W HPS lamps with E39 base and S55 ANSI code. Verify ballast compatibility and arc tube voltage before ordering.

Before Ordering — Verify

• ANSI / Lamp Code: Confirm the existing lamp or equipment manual matches S55.
• Wattage: Confirm the fixture is rated for 150W.
• Arc Tube Voltage: Confirm the ballast is rated for 55V lamp operation.
• Base Type: Confirm the socket matches E39 Mogul Screw.
• Ballast Compatibility: This lamp requires an HPS-rated ballast and ignitor. It will not operate on a Metal Halide or Mercury Vapor ballast.
• Burn Position: Fixture supports Universal operation — no restriction.
• Physical Fit: Confirm ED23.5 bulb shape, 7.75" MOL, 2.94" diameter, and fixture clearance against the existing lamp or fixture manual.

Safety and Handling Guidelines

• Correct Ballast Required: Use only with an HPS-compatible ballast and ignitor rated for this lamp. Using an incompatible ballast can result in lamp failure or fixture damage.
• High-Pressure Arc Tube: HPS lamps operate under high internal pressure. Always use appropriate eye protection when handling or replacing lamps. Allow lamps to cool fully before removal.
• Warm-Up / Restrike Time: HID lamps require a warm-up period to reach full output. After a power interruption, allow the lamp to cool before restarting — a hot restrike attempt can damage the lamp or ballast.
• Approved Fixtures Only: Install only in fixtures rated for the listed lamp type, wattage, voltage, and operating position.
• Mercury Content: Contains mercury (reduced content — ALTO). Do not dispose of in regular trash. Recycle through an approved lamp recycling program in accordance with federal, state, and local regulations.

Compliance

• ALTO designation indicates reduced mercury content per Philips ALTO series standards.
• Contains mercury — subject to applicable lamp recycling and disposal regulations. California, Washington, and other states may have mandatory take-back or handling fee requirements.
• Verify RoHS compliance status, UL listing, Title 20, and Prop 65 requirements with the Philips manufacturer specification sheet prior to use in regulated installations.

Ordering Information

• Brand: Philips Lighting
• Philips Order Code: 368746
• SKU: PHLB-368746
• UPC / EAN: 046677368746
• ANSI Code: S55
• Wattage / CCT: 150W / 2100K Warm Amber
• Base: E39 Mogul Screw
• Packaging: Sold individually.
• Case quantities and bulk pricing: Contact ADL Supply for volume orders.

For wholesale pricing, bulk availability, or help confirming the correct replacement lamp, contact ADL Supply at 1-800-235-3489.