40W T9 Circline Fluorescent Bulb vs Satco S6501 T9 Circline Lamp

The 40W T9 circline is the brighter, warmer choice: about 2950 lumens at 4100K cool white, a good fit for kitchens, garages and utility rooms where you need light output. The Satco S6501 runs on 22W and gives roughly 980 lumens at 6500K daylight, so it suits small fixtures where a crisp, bluish-white light is wanted and output matters less. Both are non-dimmable 4-pin T9 circlines with 360-degree spread and a 3-year warranty, and both are rated around 11,000 to 12,000 hours, so the real split is brightness and color, not build.

• Choose the 40W circline if you need strong, neutral-white light from a 4-pin circline fixture and want the higher lumen output.
• Choose the Satco S6501 if your fixture is small, you want a daylight 6500K tone, and lower output is acceptable.