LIFX A19 vs A21: Which SuperColor Bulb Fits Your Fixture?
By LIFX Smart Lighting | Wi-Fi Bulbs, No Hub Required | Published: 2026-10-21
Category: Comparisons
Compare LIFX SuperColor A19 and A21 bulb bundles with the Industrial Cube Base. Learn which size delivers the brightness and fit for your desk, shelf, or bedside table.
Quick answer
Choose the LIFX SuperColor A19 bundle for standard lamps and tighter spaces; pick the A21 bundle if you need maximum brightness and have a larger fixture that accepts the bigger bulb.
Brightness and physical fit: the main trade-off
Both the A19 and A21 bundles use the same 3.5-inch cement Industrial Cube Base and support tunable whites from 1500K to 6500K plus full color. The key difference is how much light each bulb can push out and whether it will physically fit your existing lamp or fixture.
The SuperColor A19 outputs 1100 lumens — plenty for a bedside table, desk lamp, or shelf accent. The A21 steps up to 1600 lumens, making it better for larger rooms or when you really want the light to fill a corner.
But the A21 bulb is physically bigger. If you plan to use the bulb separately from the cube base, or already own a lamp with a tight shade or enclosed fixture, the A19 is the safer fit.
Cube base compatibility: both bundles share the same base
The Industrial Cube Base is identical for both bundles. It’s a cement base designed for desks, shelves, and bedside tables — you just drop the bulb in, screw it tight, and connect over Wi-Fi. No hub required.
Since the base is the same, your choice really comes down to the bulb size and brightness you want. If you already have the base (or plan to use the bulb in another fixture), the A19 is more versatile for standard lamps. The A21 is more of a statement piece when used with the cube base alone.
Which bulb fits your situation?
- Fixture size matters: The A19 fits standard table lamps, floor lamps, and most enclosed fixtures. The A21 is taller and wider — it may not fit under a small shade or inside a closed globe.
- Brightness vs. wattage limits: The A19 delivers 1100 lumens; the A21 delivers 1600 lumens. If your fixture has a maximum wattage rating, check that the bulb's actual draw doesn't exceed it — the A21 draws slightly more power.
- Whether you'll use the cube base: If you always keep the bulb in the Industrial Cube Base, both sizes work. If you plan to move the bulb to another lamp, the A19 is more likely to fit standard sockets without sticking out or looking oversized. If you mostly use the cube base, pick the A21 for extra brightness. If you switch bulbs between fixtures often, choose the A19.
Product facts at a glance
- LIFX SuperColor A19 + Industrial Cube Base Bundle: The LIFX SuperColor A19 bundle delivers 1100 lumens of vivid color and brilliant whites from a 3.5-inch cement base. 1100 lumens is bright enough for most personal spaces, but if your fixture is small or you need less light, this size fits standard lamps easily.
LIFX SuperColor A19 + Industrial Cube Base Bundle - LIFX SuperColor A21 + Industrial Cube Base Bundle: The LIFX SuperColor A21 bundle delivers 1600 lumens of vivid color and brilliant whites from the same 3.5-inch cement base. 1600 lumens gives you a noticeably brighter glow for larger areas, but the A21 bulb is physically bigger — check your lamp shade clearance before buying.
LIFX SuperColor A21 + Industrial Cube Base Bundle
Which one should you pick?
Best for
- Standard lamps and tight fixtures: LIFX SuperColor A19 bundle (1100 lumens, fits most sockets)
- Maximum brightness in open setups: LIFX SuperColor A21 bundle (1600 lumens, larger bulb)
Consider something else if
- You need a small bulb for a desk lamp with a narrow shade — the A19 works fine, but the A21 may not fit.
- You already own a LIFX A19 and want to add more light — the A21 is brighter, but check your fixture size first.
