20 Watt LED A21 Bulb - 2000 Lumens - Medium E26 Base - 120-277V
20 Watt LED A21 Bulb - 2000 Lumens - Medium E26 Base - 120-277V
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Specifications
A21 LED Bulbs FAQs
What is an A21 LED bulb and how does it differ from A19?
A21 is a larger A‑shape bulb (~2.6 in. diameter) that holds more LEDs and heat sinking than A19, enabling higher lumen output for bigger rooms or higher ceilings.
How bright are A21 LEDs and what are typical use cases?
A21 LEDs often provide 1500–2500 lumens (≈100–150 W incandescent replacement), ideal for large table lamps, high-ceiling fixtures, and bright general lighting.
What wattage do A21 LEDs draw versus incandescent or CFL?
Most draw ~13–23 W for the brightness of 100–150 W incandescent, saving about 75–85% energy and reducing relamps with 15,000–25,000‑hour lifetimes.
Which base types and voltages are common for A21 LEDs?
E26 medium base at 120 V is most common in North America; some high-output A21s may support 120–277 V. Always verify base, voltage, and overall length before purchase.
Are A21 bulbs dimmable and how do I avoid flicker or buzz?
Many A21 LEDs are dimmable when paired with listed LED dimmers. Use the manufacturer’s compatibility sheet to minimize shimmer, buzz, or drop‑out at low levels.
Can A21 LEDs go in enclosed fixtures or ceiling fans?
Only install in enclosed fixtures or fans if the bulb is rated for that environment. Larger A21 envelopes trap more heat; follow the label for enclosure and ambient limits.
What color temperatures and CRI are best for large rooms?
For comfortable brightness in big spaces, 2700–3000K gives warm ambience; 3500–4000K is a clean neutral. Choose CRI 90+ where color fidelity matters.
How do size and heat affect A21 fit in my shades or cans?
A21s are bigger than A19s; check globe/harp clearance and trim openings if using adapters. Avoid tight enclosures unless the bulb is explicitly rated for them.
Are there high-output or smart A21 options?
Yes—some A21 lines offer high‑output models and a smaller selection of smart/tunable versions. Confirm app ecosystem and Wi‑Fi/Bluetooth hub requirements.
What certifications and warranties should I check?
Look for UL/ETL listing, Energy Star where offered, Title 20/JA8 where required, and a 3–5 year warranty. Review operating temperature and switching limits.
