What are some of the best-selling HALCO LIGHTING TECHNOLOGIES led light bulbs?

One of our best-selling HALCO LIGHTING TECHNOLOGIES led light bulbs is the <a href="https://www.homedepot.com/p/HALCO-LIGHTING-TECHNOLOGIES-4-ft-14-Watt-T8-Non-Dimmable-LED-Linear-Light-Bulb-Type-B-Bypass-Double-Ended-Daylight-5000K-10-Pack-T8FR14-850-BYP3-DE-LED10PK-89003/308101924?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">4 ft. 14-Watt T8 Non-Dimmable LED Linear Light Bulb Type B Bypass Double Ended Daylight 5000K (10-Pack)</a>.

There are so many types of light bulbs! How do I choose the right one?

From LEDs to incandescents and everything in between, each bulb type has its own benefits. Not sure where to start? Our <a href="https://www.homedepot.com/c/ab/types-of-light-bulbs/9ba683603be9fa5395fab90e1115f39?emt=plpfaq_2508_lightbulbs" style="text-decoration: underline;">Types of Light Bulbs guide</a> breaks down the different kinds, explaining their energy efficiency, lifespan, and best uses, making it simple to find the perfect fit.

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.