How do I decide which light bulb shape code I need?

To choose the right light bulb shape, consider the fixture you'll be using it in and look for the code (like A19, G25, or BR30) printed on your old bulb or in your fixture's specifications, ensuring a proper fit and desired light distribution. We offer <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Feit-Electric/White/PAR30/N-5yc1vZbmbuZ3zeZ1z0vvqhZ1z1bkiy?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">par30</a>, <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Feit-Electric/White/B10/N-5yc1vZbmbuZ3zeZ1z0vvqkZ1z1bkiy?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">b10</a>, and <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Feit-Electric/White/R20/N-5yc1vZbmbuZ3zeZ1z0vvqlZ1z1bkiy?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">r20</a>.

I have an older fixture in my dining room. What type of bulb is best to replace the traditional incandescent?

While traditional <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Incandescent/N-5yc1vZbmbuZ1z0vxiy?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">incandescent bulbs</a> provide a warm light, <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/LED/N-5yc1vZbmbuZ1z0vxij?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">LED</a> or even <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Halogen/N-5yc1vZbmbuZ1z0vxiw?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">halogen</a> options are great for energy-efficient replacements; be sure to check the base type and wattage for compatibility with your existing fixture. These replacements will also last significantly longer.

What are bi-pin and 4-pin bases, and what are they used for?

<a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Bi-Pin/N-5yc1vZbmbuZ1z0tnc5?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">Bi-pin bases</a>, including the <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Miniature-Bi-Pin/N-5yc1vZbmbuZ1z21ms6?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">miniature</a> and <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/Medium-Bi-Pin/N-5yc1vZbmbuZ1z21luf?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">medium bi-pin</a>, have two small pins that push into a socket commonly used for halogen or some LED bulbs in undercabinet lighting or desk lamps. <a href="https://www.homedepot.com/b/Lighting-Light-Bulbs/4-Pin/N-5yc1vZbmbuZ1z21lyb?emt=plpfaq_2504_lightbulbs" style="text-decoration: underline;">4-pin bases</a>, with their four pins, are often found in fluorescent and compact fluorescent (CFL) bulbs; they are designed for fixtures requiring a more secure connection and may need specific ballast compatibility.