I'm looking for a tubular bulb for my fixture, and I see "T8," "T5," and "T12" listed. What do these "T" numbers mean, and how do they differ?

The "T" in these codes indicates a tubular shape, often used for fluorescent or LED tubes, and the number represents the tube diameter in eighths of an inch; thus, a <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/T8/N-5yc1vZbmbuZ1z0vvri?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">T8 bulb</a> is 1 inch in diameter, while a <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/T5/N-5yc1vZbmbuZ1z0vvq7?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">T5 bulb</a> is 5/8 of an inch, and a <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/T12/N-5yc1vZbmbuZ1z0vvrc?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">T12</a> is 12/8 of an inch (or 1.5 inches), with the smaller diameter often correlating to newer, more energy-efficient models. Choose the correct number that matches the socket in your fixture.

Which light bulbs are the best selling?

The <a href="https://www.homedepot.com/p/EcoSmart-60-Watt-Equivalent-Smart-A19-Color-Changing-CEC-LED-Light-Bulb-with-Voice-Control-4-Bulb-Powered-by-Hubspace-12A19060WRGBWH4/329945546?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">60-Watt Equivalent Smart A19 Color Changing CEC LED Light Bulb with Voice Control (4-Bulb) Powered by Hubspace</a> is one of our best-selling light bulbs.

Are tube lights only used in commercial settings, or can I use them at home?

While commonly used in garages and basements, <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs-Tube-Lights/N-5yc1vZbm3z?catStyle=ShowProducts?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">tube lights</a>, especially LED tube lights, are becoming increasingly popular for their energy efficiency and bright light in home workshops, under-cabinet lighting, and even for creating a modern, minimalist look in certain rooms. They offer a lot of options for different areas of the house.

What's the difference between "Daylight" and "Soft White" bulbs?

"Daylight" bulbs offer a crisp, energizing, blue-toned light that's perfect for task lighting in areas like kitchens or offices, while "Soft White" provides a warm, cozy, yellow-toned light ideal for relaxing spaces like living rooms and bedrooms. To learn more about which is right for you, check out our <a href="https://www.homedepot.com/c/ab/daylight-bulbs-vs-soft-white-bulbs/9ba683603be9fa5395fab901b9389c60?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">Daylight Bulbs vs Soft White Bulbs guide</a> to help you decide.

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