The cap or base of a light bulb joins the bulb to the lamp socket in order to provide an electrical connection. Your lamp or fixture’s socket will dictate which cap or base a light bulb needs in order to fit, but there are a number of different base types and sizes to choose from, and it’s not always easy to determine which type is right for your fixture. To add to the confusion, different fixtures often feature different types of sockets.

Purchasing a bulb with the wrong cap or base is a common mistake. There are a wide variety of caps and bases available, and it can be difficult to know which one is right for your fixture, especially if its socket is not a standard size. To help you find the right cap or base for your fixture, we’ve created a guide to the most common light bulb caps and bases. If you are still unsure after reviewing our guide, we are happy to assist you to find the right bulb.

When you’re shopping for new bulbs or upgrading to energy efficient lamps, these are some of the caps and bases you’re most likely to encounter:


It’s disappointing to get home after buying a light bulb only to discover it’s the wrong size or type of base. Nobody wants the hassle of going back to the shop and making a return. Understanding what to look for with regards to terms and codes on bulb packaging can help save you time, effort, and even money in the long run.

If you are still unable to locate the cap type for your particular Light Bulb then please call us on: 01274493830.

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