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Clear tubular HID bulb with mogul screw base, ED23-1/2 shape

Philips

Philips C150S55/ALTO High Pressure Sodium Lamp 150 W 55 V

SKU CH-VW15-95KM4

High-pressure sodium lamp delivering 16,000 lumens at 2100K with a 24,000-hour rated life and universal burning position

  • Product typeSpecialty Equipment Lamps
  • High 16,000 lumen output for bright area lighting
  • 24,000 hour rated life reduces replacement frequency
  • 2100K warm colour temperature suits outdoor applications
  • Universal burning position allows flexible fixture mounting
  • Clear ED23-1/2 glass envelope with E39 mogul screw base

150 W High Pressure Sodium Lamp

This 150 watt high pressure sodium lamp delivers 16,000 lumens at a warm 2100 K colour temperature. It carries ANSI code S55 and is rated for 24,000 hours of operation. The clear ED23-1/2 glass envelope measures 7 3/4 inches overall with a 2 15/16 inch diameter. It is designed for universal burning position in enclosed fixtures.

Mogul Screw Base and Glass Construction

The lamp uses a standard mogul screw (E39) base for secure connection to compatible ballasts. Its glass housing is not shatter-resistant, so careful handling and installation are required. The 360 degree beam angle provides omnidirectional light distribution suitable for area lighting. Voltage is ballast dependant at 55 volts, and the lamp is not dimmable.

Low Colour Rendering and Fixed Output

The colour rendering index of 17 limits use to applications where colour accuracy is not critical, such as street or security lighting. The lamp cannot be dimmed and must operate on a matching ballast, restricting flexibility in retrofit projects. Buyers needing high CRI or adjustable output should consider alternative light technologies.

How it compares

Measured against everything we stock in Lighting Fixtures & Bulbs, at today’s prices. Recalculated every night.

Price $24.99
Cheaper than about 58% of the 491 comparable items (median $28.99).

Specifications

Product
Brand namePhilips
Product typeSpecialty Equipment Lamps

Questions about this item

How does the S55 ANSI code limit the ballast I can use with this 150 W lamp?

The ANSI S55 code means the lamp requires a matching S55 ballast rated for 150 W at 55 V; using any other ballast type will prevent proper starting and can damage the lamp.

What fixture dimensions are needed to fit the ED23-1/2 envelope and mogul screw base?

The lamp measures 7 3/4 in overall length with a 2 15/16 in diameter bulb and an E39 mogul screw base, so the enclosure must clear those dimensions and accept the large base.

Why must the fixture be enclosed even though the lamp has a universal burning position?

The glass envelope is not shatter-resistant and the lamp operates at high pressure, so an enclosed fixture is required to contain any possible rupture regardless of mounting angle.

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