PHILIPS 433391 | PL-T ALTO 26W/835/4P | 3500K Soft White Triple Tube

The Philips 433391 (PL-T ALTO 26W/835/4P) is a high-performance, non-amalgam compact fluorescent lamp designed for maximum versatility and efficiency. Featuring a specialized Triple-Tube T4 design, this 26-watt lamp is ideal for compact fixtures where high light output is required from a small footprint. Utilizing ALTO® low-mercury technology, it provides an environmentally responsible solution with only 1.4mg of mercury. The 3500K Soft White output delivers 1,750 lumens of balanced, natural light, making it a preferred choice for professional office spaces, retail environments, and hospitality settings that utilize electronic dimming or programmed start ballasts.

Product Overview

The Philips 433391 stands out for its high lumen maintenance, retaining 81% of its light output even at 12,000 hours of use. Its non-amalgam construction allows for faster run-up times and stable performance across various operating temperatures. As an Energy Class A rated product, it offers an excellent efficacy of 65.1 lm/W, helping facilities reduce energy consumption without compromising on visual comfort. This 4-pin model is fully dimmable when used with compatible high-frequency electronic ballasts, providing building managers with flexible control over light levels and energy savings.

• Sustainable Design: Contains roughly 80% less mercury than traditional CFLs, passing the EPA TCLP test.
• Superior Maintenance: Industry-leading lumen maintenance ensures consistent brightness throughout the lamp's life.
• Optimized for HF Ballasts: Designed for use with high-frequency electronic ballasts to ensure flicker-free operation.
• Compact Form Factor: The triple-tube (3U) geometry allows for higher wattage in smaller, more decorative fixtures.

Technical Specifications

• Brand: Philips ALTO
• Order Code / SKU: 433391 (43339-1)
• Model: PL-T 26W/835/4P/ALTO
• Base Type: GX24q-3 (4-Pin)
• Wattage: 26W
• Color Temperature: 3500K (835)
• CRI: 82
• Initial Lumens: 1,750 lm
• Rated Life: 13,000 Hours
• Mercury Content: 1.4 mg
• Max Overall Length: 126.7 mm (approx. 5.0")
• Diameter: 41 mm

Safety & Installation Guide

• Ballast Compatibility: This is a 4-pin lamp for use with Electronic Ballasts only. Do not use with magnetic ballasts.
• Dimming: Fully dimmable when paired with an appropriate electronic dimming ballast.
• Insertion: Ensure the power is off. Align the pins and push until the lamp clicks into the GX24q-3 socket. The base is keyed for 26W sockets specifically.
• Environmental Note: Although low-mercury, this lamp contains mercury and should be recycled according to local, state, or federal laws.

Primary Applications

• Recessed Downlights: The standard choice for commercial office and retail ceiling fixtures.
• Wall Sconces: Compact size fits well in decorative hallway and lobby lighting.
• Task Lighting: High CRI and 3500K color temperature provide excellent clarity for work surfaces.
• General Ambient Lighting: Reliable for long-burn applications in schools, hospitals, and airports.