A21 3-way LED bulb with medium E26 base and dimmable multi-level output; 120V input, 4W/8W/16W settings (480–1,600 lumens) with 80 CRI and Energy Star rating.

A21 3-Way LED Bulb 4W 8W 16W 480–1600 Lumens 80 CRI Dimmable Medium E26 Base Energy Star Rated 120V

TCP

Used in residential fixtures requiring multi-level light output from a single lamp. This TCP A21 three-way LED bulb provides selectable lumen levels with dimming compatibility. It installs in standard E26 sockets on 120V systems and is Energy Star rated.


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Technical Specifications & Performance Data

Brand TCP
Wattage/Lumens 4W (480), 8W (800), 16W (1600)
Input Voltage 120V
Lamp Type LED
Color Temperature 2700K, 3000K, 4100K, 5000K
CRI 80
Dimmable Yes
Base Medium E26
Certifications cULus Listed, Energy Star Rated
Dimensions 2.6"D × 4.9"H
Rated Hours 25,000
Warranty 5 Years

Project Documentation & Technical Downloads

Technical FAQ Deep-Dive

Where is an A21 3-way LED lamp commonly specified?

This A21 3-way lamp is typically specified for table lamps, floor lamps, and portable luminaires in offices, hospitality spaces, reception areas, and multifamily common areas where three discrete light levels are preferred without changing the fixture.

How do the three wattage settings relate to delivered light output?

The lamp provides three output steps: 4W at 480 lumens, 8W at 800 lumens, and 16W at 1,600 lumens. This supports low-level ambient lighting, mid-level general lighting, and higher output for reading or task use in the same socket.

What type of switch is required to use the 3-way function?

A 3-way lamp requires a 3-way socket and 3-way switch to access all three output levels. In a standard on/off socket, the lamp will not cycle through the three settings as intended.

Is this lamp dimmable, and how does that interact with 3-way operation?

The lamp is dimmable, but dimming performance depends on the control method and the fixture wiring. For a 3-way application, verify whether the lamp is intended to dim on each step using a compatible dimmer, or whether dimming is intended only in a standard socket configuration with an approved dimmer list.

How should 2700K, 3000K, 4100K, and 5000K be selected for different spaces?

2700K is commonly used in hospitality and lounge areas where a warm appearance is preferred. 3000K is often selected for reception areas and mixed-use spaces that need a warm-neutral tone. 4100K is typically used in office settings where a neutral white appearance is common. 5000K is often chosen for higher-visibility task use where a cooler appearance supports contrast and detail recognition.

What does CRI 80 support for typical use cases?

CRI 80 supports reliable color rendering for everyday tasks such as reading printed materials and evaluating general finish colors in an office or residential-style environment. If the application involves color-critical work, confirm whether a higher CRI lamp is required.

What does the medium E26 base mean for fixture compatibility?

The medium E26 base fits standard North American medium-base sockets. Confirm physical clearance in enclosed shades or tight harp setups using the lamp dimensions of 2.6 inches diameter by 4.9 inches height.

What does Energy Star certification support?

Energy Star certification indicates the lamp meets program requirements for efficiency and performance. This can be relevant for projects or procurement standards that reference Energy Star-labeled lamps.

What is the rated life for this lamp, and what does it mean in practical use?

The lamp is rated for 25,000 hours. Actual service life depends on operating hours, switching frequency, ambient temperature within the fixture, and voltage conditions on the circuit.

What is covered by the 5-year warranty, and what should be documented?

The lamp includes a 5-year warranty. For warranty administration, retain purchase documentation and record the installation location and quantity by area so failures can be tracked and replaced consistently.


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