Product Overview

The Pentair Amerlite® 78949100 is a genuine Pentair full-size underwater incandescent pool light engineered to provide bright, dependable white illumination for residential and commercial swimming pools. As one of the most trusted underwater lighting systems in the industry, the Amerlite series has earned a reputation for durability, serviceability, and long-lasting performance.

This model features a 400-watt white incandescent lamp, operates on 120 volts, and includes a factory-installed 100-foot cord, making it ideal for installations where the junction box or equipment pad is located farther from the pool. It is designed for installation in compatible full-size Pentair, American Products, PacFab, and Purex wet niches.

The Amerlite features a durable stainless steel shell, stainless steel face ring with Pentair's Uni-Tension™ clamp, and an 8-3/8-inch prismatic tempered glass lens that provides excellent light diffusion across the pool. A built-in thermal protection system helps protect the fixture by shutting the lamp off if operated without sufficient water cooling. Amerlite lights are UL listed and approved for freshwater pools with salinity levels up to 6,000 ppm.

Key Features

Genuine Pentair Amerlite® underwater pool light

Part Number: 78949100

Full-size 10-inch pool light

White incandescent lighting

400-watt lamp

120-volt operation

Factory-installed 100-foot cord

Stainless steel housing

Stainless steel face ring

Uni-Tension™ mounting clamp

8-3/8-inch prismatic tempered glass lens

Low-water thermal cutoff protection

Fits compatible Pentair, American Products, PacFab, and Purex niches

UL listed for underwater installation

Benefits

Produces bright white underwater illumination

Proven Amerlite design trusted for decades

Stainless steel construction resists corrosion

Long 100-foot cord accommodates distant equipment pads

Compatible with many existing full-size Pentair niches

Serviceable design allows bulb replacement without lowering pool water

Excellent replacement for existing Amerlite incandescent fixtures

Suitable for residential and commercial swimming pools

Specifications

Warranty & Compatibility

Installation Information

The Pentair Amerlite 78949100 should be installed by a qualified pool professional or licensed electrician in accordance with Pentair installation instructions, the National Electrical Code (NEC), and all local electrical regulations.

Before installation:

• Verify the electrical supply is 120 volts.
• Confirm a compatible full-size wet niche is installed.
• Ensure the 100-foot cord is sufficient to reach the junction box.
• Verify proper bonding, grounding, and GFCI protection.
• Inspect the conduit and niche before installation.

Never energize the light unless it is completely submerged in water.

Confirm Before Ordering

• Confirm Pentair part number 78949100.
• Verify the existing fixture is a full-size Amerlite-style light.
• Confirm 120V electrical service.
• Verify a 100-foot cord is required.
• Confirm compatibility with the existing wet niche.
• Do not confuse this model with 50-foot, 150-foot, or 200-foot cord versions.
• Verify the required cord length before ordering.
• Professional installation is recommended.

Warranty Information

This genuine Pentair lighting product is covered under Pentair's applicable limited manufacturer warranty.

Warranty eligibility may depend on purchase through an authorized Pentair dealer, professional installation, proper electrical installation, and compliance with Pentair's installation requirements.

Damage resulting from improper wiring, incorrect voltage, water intrusion caused by improper installation, freeze damage, misuse, or unauthorized modification may not be covered.

Retain your original purchase receipt and installation documentation for warranty service.

Customer-Facing Q&A

Q: Is this an LED light?
A: No. The 78949100 is a traditional 400-watt white incandescent underwater pool light.

Q: What voltage does it require?
A: It operates on 120 volts.

Q: How long is the factory cord?
A: This model includes a 100-foot factory-installed cord.

Q: Will it fit my existing Pentair niche?
A: It is designed for compatible Pentair full-size niches and many legacy American Products, PacFab, and Purex niches.

Q: Can it be used in a saltwater pool?
A: Yes. Pentair approves Amerlite lights for freshwater pools with salt concentrations up to 6,000 ppm.

Q: Can the bulb be replaced?
A: Yes. Amerlite lights feature a serviceable incandescent bulb design, allowing bulb replacement without lowering the pool water level when serviced correctly.