The current bulb that came with the fixture is a Hanstar FCL-22W Daylight, is this the correct replacement bulb?

Yes, Tommy, that's the correct replacement bulb. The only difference is your original FCL-22W is a Daylight bulb, and the Philips 391169 is Cool White Plus bulb. It will work, but there will be a slight difference in the color of the two bulbs, the Philips 391169 being 'Daylight' and the Hanstar FCL-22W being 'Cool White'.

My bulb says fc8 t9/kb, is this the correct replacement?

kB means kitchen and bath, so a different color temperature. But it will plug and play.

how do I test it on the work bench

An interesting question. Unless you have a transformer that produces the correct voltage and amperage, you can’t. However generally speaking, the rate of defective fluorescent bulbs from the factory is very, very low. If your old bulb stopped working and the new one doesn’t either, I would suggest buying a new ballast. They’re cheap and easy to replace and are likely to solve your problem.

DO I measure the inches on the outside or inside of the bulb?

The measurements are not a big issue with circular bulbs. Always go by the item number on bulb & 100% of the time it will be the bulb you want. The measurements are not accurate whether inside or outside, they will vary!!

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💡 Light up your workspace, save the planet, and never miss a detail!

SPACE SAVVY DESIGN - Compact 8-inch circline shape fits seamlessly into ceiling fixtures, maximizing lighting coverage.
WORK MODE BRIGHTNESS - Cool white light creates a focused, productive environment perfect for garages and workshops.
DURABLE LIGHTWEIGHT - Only 45g and built to last, ensuring hassle-free installation and long-term use.
ECO CONSCIOUS INNOVATION - Industry-leading low-mercury technology with recycled materials for guilt-free illumination.
VERSATILE LIGHTING SOLUTION - Ideal for general purpose lighting anywhere in your home, blending function with style.

The Philips 391169 Circline Fluorescent 22-Watt T9 Cool White Light Bulb delivers efficient, bright cool white light ideal for workspaces like garages and workshops. Featuring an 8-inch circline design with a bi-pin base, it fits ceiling fixtures perfectly. Philips leads with eco-friendly innovation by using low-mercury recycled materials, reducing environmental impact without compromising performance.

Product Dimensions	20.32 x 2.62 x 2.62 cm; 45.36 g
Item Weight	0.1 Pounds
Batteries required	No

Philips 391169 Circline Fluorescent 22-Watt 8-Inch T9 Cool White Light Bulb

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