Can I use universal light bulbs in any fixture in my home?

Universal light bulbs generally refer to bulbs designed for various applications and fixtures, meaning they're versatile for different settings. Always double-check your fixture's requirements to ensure the bulb's base, wattage, and voltage match; following the guidelines helps ensure safety and compatibility for any light fixture around the house.

For bulbs labeled A19, A15, and A21, what does the "A" mean, and how do those numbers relate to the bulb?

The "A" refers to the traditional, pear-shaped bulb, a common style for homes. The number indicates the bulb's diameter at its widest point, in eighths of an inch, so an <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/A19/N-5yc1vZbmbuZ1z0vvrd?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">A19 bulb</a> is 19/8 inches wide, an <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/A21/N-5yc1vZbmbuZ1z0vvpm?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">A21</a> is slightly larger at 21/8 inches, and an <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/A15/N-5yc1vZbmbuZ1z0vvqn?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">A15</a> is smaller at 15/8. Knowing this helps when choosing the right size for your fixtures and the light needed.

When should I choose flood or spotlight bulbs, and what's the difference?

<a href="https://www.homedepot.com/b/Lighting-Light-Bulbs-Flood-and-Spot-Light-Bulbs/N-5yc1vZ2fkpcw3?catStyle=ShowProducts?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">Flood light bulbs</a> produce a wide beam, ideal for illuminating large areas like patios or driveways. In contrast, spotlight bulbs focus their beam more narrowly, making them perfect for highlighting artwork or architectural features, giving you options for different needs and purposes. Both can be used indoors or outdoors, depending on the fixture.

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EcoSmart75-Watt Equivalent BR40 Energy Star and Dimmable LED Flood Light Bulb in Soft White 2700K (2-Pack)

(4.4 / 106)

Model# 11BR40075WESD01

$1078

($5.39 /bulb)

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EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Soft White (3-Pack)

(4.4 / 844)

Model# R20-1D 11W E26 120V 2700K

$1498

($4.99 /bulb)

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EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Bright White (3-Pack)

(4.4 / 844)

Model# R20-1D 11W E26 120V 3000K

$1498

($4.99 /bulb)

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EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Daylight (3-Pack)

(4.4 / 844)

Model# R20-1D 11W E26 120V 5000K

$1498

($4.99 /bulb)

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EcoSmart75-Watt Equivalent PAR30 Dimmable CEC Adjustable Beam LED Spot Light Bulb with Selectable Color Temperature (1-Pack)

(4.4 / 142)

Model# G19P30AD5DUO

$898

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EcoSmart75-Watt Equivalent Wide Surface Non-Dimmable LED Light Bulb Daylight (1-Pack)

(4.6 / 648)

Model# 11UFO075WULND02

$798

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65/75/90-Watt Equivalent BR30 3-Way Flood Energy Star Dimmable CEC LED Flood Light Bulb Soft White (2-Pack)

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EcoSmart65/75/90-Watt Equivalent BR30 3-Way Flood Energy Star Dimmable CEC LED Flood Light Bulb Soft White (2-Pack)

(4.5 / 196)

Model# FG-04309

$1298

($6.49 /bulb)

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EcoSmart75-​Watt Equivalent BR40 Energy Star and Dimmable LED Flood Light Bulb in Soft White 2700K (2-​Pack)​

EcoSmart75-​Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Soft White (3-​Pack)​

EcoSmart75-​Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Bright White (3-​Pack)​

EcoSmart75-​Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Daylight (3-​Pack)​

EcoSmart75-​Watt Equivalent PAR30 Dimmable CEC Adjustable Beam LED Spot Light Bulb with Selectable Color Temperature (1-​Pack)​

EcoSmart75-​Watt Equivalent Wide Surface Non-​Dimmable LED Light Bulb Daylight (1-​Pack)​

EcoSmart65/​75/​90-​Watt Equivalent BR30 3-​Way Flood Energy Star Dimmable CEC LED Flood Light Bulb Soft White (2-​Pack)​

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EcoSmart75-Watt Equivalent BR40 Energy Star and Dimmable LED Flood Light Bulb in Soft White 2700K (2-Pack)

EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Soft White (3-Pack)

EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Bright White (3-Pack)

EcoSmart75-Watt Equivalent R20 Dimmable Energy Star LED Flood Light Bulb Daylight (3-Pack)

EcoSmart75-Watt Equivalent PAR30 Dimmable CEC Adjustable Beam LED Spot Light Bulb with Selectable Color Temperature (1-Pack)

EcoSmart75-Watt Equivalent Wide Surface Non-Dimmable LED Light Bulb Daylight (1-Pack)

EcoSmart65/75/90-Watt Equivalent BR30 3-Way Flood Energy Star Dimmable CEC LED Flood Light Bulb Soft White (2-Pack)