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Light bulb types and fittings

Find the light bulb you need with our guide to the different types, sizes and fittings.

Shop all light bulbs
Light bulb types and fittings.
Philips LED Filament E27 6.5W (40W) Dim Giant Bulb - Gold.

Light bulbs guide

Choosing bulbs for your lights can be tricky. There's a range of types and fittings, all with different codes to identify how they should be used. Some serve a functional purpose for lamps or spotlights, while others can be used to make a real style statement.

Luckily our guide is here to help you find the right bulbs for the lighting in your home.

    Light bulb types

    All light bulbs have a code to identify their type of fitting. The letters tend to stand for the name of the fitting and the numbers are the diameter of the fitting in millimeters. For example, an E27 is an Edison Screw bulb with a diameter of 27 millimeters.

      ES (Edison screw) light bulbs

      Edison screw fittings are one of the most commonly used around the home. The main two types of ES bulbs are the E27, used in many household lamps, and the less common E14, AKA the SES (small Edison screw).

      BC (bayonet cap) light bulbs

      Bayonet cap bulbs use a twist and lock action to secure into the fitting. They are used in a variety of lighting around the home and one of the most common types of fittings. The most common code is for bayonet caps is B22.

      G4 and G9 light bulbs

      G4 and G9s, or capsule bulbs, are similar to bayonet caps, in that they need to be pushed in, twisted and locked. The difference is that they use two connection pins, which are much smaller, at 4 and 9mm respectively. Most commonly used in cooker hoods.

      GU5.3 and GU10 bulbs

      GU5.3 and GU10 are the different types of down and spotlights you can find around your home. They connect through twin pins, which use a push and twist mechanism to fit into the socket.

      R7 light bulbs

      R7s are longer than other light bulbs and have connections at either end. They are most likely to be used in home security or flood lighting due to their increased brightness.

      LED light bulbs

      Philips LED Filament E27 6.5W (40W) Dim Giant Bulb - Gold.

      Benefits of LED light bulbs

      LED light bulbs will soon be the only type of bulb that you can buy in the UK. LED bulbs can last up to 25 years, far longer than halogen bulbs, which may need replacing after 1 year of use. LEDs are far more cost effective, saving you up to £240 a year, while halogens produce more heat and use 85% more power.

      Lighting inspiration

      Osram Vintage 1906 7W LED Warm White Edison Bulb.

      Vintage light bulbs

      Osram Vintage 1906 7W LED WarRethink your lighting with our range of statement-making vintage light bulbs. From the attention-grabbing sizes, to the classically soft glow and innovative LED filament technology, these long-lasting bulbs are all about making your lighting a little bit different.m White Edison Bulb.

      Philips LED Filament E27 6.5W (25W) Dim Giant Bulb - Smoky.

      Warm and cold lighting

      You can adjust some smart lighting to offer warm or cold tones. Warmer lighting tends be a yellowy orange, while cool lighting can be described as frosty white. The brightness that's best for you depends on the atmosphere you want to create in your room.

      Philips LED Filament E27 6.5W (40W) Dim Giant Bulb - Gold.

      Giant bulbs

      Is bigger always better? Giant light bulbs can make a real style statement in your home. Add to a living room or dining room to create a unique ambience and talking point.

      LIFX Mini A19 B22 Bulb.

      Smart light bulbs

      Combine your lighting with your phone to give you full control over the light in your home. With these bulbs, you can turn the lights on and off, adjust the brightness and ambience and choose different colours - all through an app on your phone.

      Lighting top picks

      Lighting guides

      Unique and unusual lighting

      Add a little statement lighting to your home with our guide to unique and unusual lighting.

      Kitchen lighting ideas

      Our guide to kitchen lighting looks at the types of ceiling lights and how to choose the best ones for your kitchen.

      Bathroom lighting ideas

      Light up your bathroom space with our guide to ceiling and wall lights, illuminated mirrors and maximising natural light.

      Lighting buying guide

      Find the best lighting for your home with our full guide to the types of lamps and lights.

      Why buy at Argos?