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Clear ED18 high-pressure sodium lamp with mogul screw base

Philips

Philips C400S51/ALTO NC HPS 400W ED18 Mogul Screw 50000lm

SKU CH-T85R-GCHR1

High-pressure sodium lamp delivers 50,000 lumens at 2100K with 30,000-hour rated life

  • Product typeLight Bulbs
  • Product colorTransparent
  • 50 000 lumens deliver intense illumination for large areas
  • 30 000 hour rated life reduces replacement frequency
  • Universal burning position allows flexible fixture mounting
  • Clear ED18 glass with mogul screw base fits standard HID sockets
  • 2100 K warm colour temperature suits outdoor and industrial settings

Philips 400W High Pressure Sodium Lamp

The Philips C400S51/ALTO NC is a 400W high pressure sodium lamp built for indoor and outdoor fixtures. It delivers 50000 lumens at a warm 2100K color temperature. The ED18 bulb shape and universal burning position suit street, area and industrial lighting installations. It is rated for 30000 hours of service life.

Mogul Screw Base with Clear Glass Housing

A Mogul Screw (E39) base fits standard industrial sockets without adapters. The clear glass envelope provides a 360 degree beam angle for broad light distribution. The bulb measures 2 1/4 inches in diameter and 9 3/4 inches overall length. It is approved for enclosed fixtures but is not shatter-resistant.

120V Operation with Fixed Output

The lamp runs on 120V supply and draws 400W continuously. It is not dimmable, so light output and power draw remain constant during operation. High pressure sodium technology produces minimal visible color shift over the rated life. The ANSI S51 code ensures compatibility with matching ballasts.

How it compares

Measured against everything we stock in General-Purpose & Specialty Bulbs, at today’s prices. Recalculated every night.

Price $38.99
Pricier than about 72% of the 1,791 comparable items (median $17.99).

Specifications

Product
Brand namePHILIPS
Product typeLight Bulbs
Product colorTransparent

Questions about this item

What voltage does the Philips C400S51/ALTO NC HPS lamp require?

The lamp operates at 120V, so it must be used on a 120V ballast and circuit.

What are the physical dimensions and base type for mounting this bulb?

It uses a Mogul Screw (E39) base, measures 2 1/4 in diameter and 9 3/4 in overall length, and fits ED18 sockets.

How is the Philips C400S51/ALTO NC HPS lamp installed, and what step is often missed?

Screw the lamp into a compatible E39 socket in an enclosed fixture rated for 400W HPS; the step often missed is verifying the ballast matches the ANSI S51 code and 120V supply before powering on.

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