Which is brighter, the 40W or 32W circline?

The 40W, by a wide margin: 2,950 lumens versus 2,150. That is roughly 37% more light from the same 4-pin fixture.

Neither. Both are rated 12,000 hours and carry the same 3-year warranty, so runtime and warranty are identical.

Which color temperature should I pick?

4100K cool white for kitchens, garages, and task areas; 3000K warm white for bathrooms, hallways, and rooms where you want a softer tone.

Can either be dimmed?

No. Both are non-dimmable, so use them on a standard switch, not a dimmer.

Is the 40W worth the extra energy?

Only if you need the light. If 2,150 lumens is enough for the room, the 32W saves 8 watts per fixture with no loss in rated life.

Will either fit my existing fixture?

Both are T9 circlines with a 4-pin base, so they fit the same sockets. Check that your ballast is rated for the wattage you choose.

40 Watt - T9 - Circline Fluorescent - 4100K Cool White - 62 CRI - 4-Pin base vs 32 Watt - T9 - Circline Fluorescent - 3000K Warm White - 52 CRI - 4-Pin base

Buy the 40W 4100K circline if you need maximum light output and a neutral white tone for a kitchen, garage, or utility room. Buy the 32W 3000K if you want warmer light and lower energy draw for a bathroom or hallway. Both are non-dimmable 4-pin T9 circlines rated 12,000 hours with a 3-year warranty, so the choice comes down to brightness and color temperature, not durability.

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