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Amazon Buying Guide Light Bulbs

Choosing the Right Light Bulb

Choosing the right light bulb can be tricky. Lumen, watt, colour temperature ... what do these and other terms mean? Our helpful guide to light bulbs will give you a quick and easy overview of "what’s what" in lighting and will help you to find the right bulbs for every fixture in your home.

1. Cap Types

When you are choosing a bulb to fit a particular light or lamp in your home you will first need to make sure you choose the right cap type. The cap is the bridge between the bulb and the power-source fitting, providing just the right amount of current to make the bulb glow. But one size does not fit all and as there are different types of caps, you need to make sure that they fit your light fixture.

The most common are screw bases like the E27 for big fittings and the E14 for small fittings like candles and lustres. There are also specific caps like the GU10 and GU5.3 for spots, downlights or other special light fittings--GU10s were traditionally available only as a halogen bulb but LED variants are now available. Plus there are also B22d and B15d bayonet bulbs that are used in smaller fittings and finally low-voltage G4 and mains-powered halogens.

Check out our handy chart below to see what the different types look like. Before you buy a bulb, make a note of the code on your light fixture and check the cap code of the bulb you want to buy.

Light Bulb Screw Types

2. Light Bulb Technologies

LED Bulbs

LED Bulb

Without compromising quality, LED light bulbs offer unlimited lighting possibilities. They combine state-of-the-art technology with familiar design as they are available in the all the same shapes as classic bulbs:

• Longest lifespan of any bulb--up to 25 years

• Short switching cycles

• Very small energy consumption

If you are looking for the most sustainable lighting solution, LED bulbs are the ideal choice for you.

Halogen Bulbs

Halogen Bulb

Halogen Lights deliver the highest standards of light quality, giving natural, clear, sparkling and warm light:

• Fully dimmable

• More energy efficient than "classic" bulbs

• Short warm-up time

In short, they are the perfect choice if you are looking for the quickest and easiest way to replace classic bulbs throughout your home and still want to enjoy the same quality of clear, warm and sparkling light that you are used to.

Energy Saving Bulbs

Energy Saving Bulb

Energy-saving bulbs, also known as compact fluorescent (CLFs), are a very economical choice for use in the home and offer the perfect range of high-brightness functional lighting for interiors like workspaces, kitchens and living rooms:

• Very low energy consumption (80 per cent less than conventional bulbs)

• Long lifespan

• Available in different colour temperatures

If you are looking for an easy way to save energy and reduce your lighting bills, energy savers are a great choice.

Dimmable Bulbs

Dimmable bulb

It is important to remember that dimmers require dimmable bulbs, so keep this in mind when you are choosing your bulb. In the past, older types of energy-saving bulb tended not to be dimmable; however these have now been replaced with a new generation of non-flicker models that are also dimmable. Halogen bulbs are generally easy to control with a dimmer switch, however, not all LED lighting is designed to be dimmable, and using a non-dimmable bulb with a dimmer switch can cause the bulb to not work properly or fail completely. So if you want to buy a dimmable bulb, make sure you check the product details to see if it will work with a dimmer.

3. Colour Temperature

Modern bulbs can offer different colour temperatures, which are indicated in a unit called Kelvin (K). The colour temperature helps you create different moods--bulbs with a low Kelvin value generate warm, yellow light, which produces a relaxing mood, perfect for creating a cosy atmosphere in your home. Bulbs with a high Kelvin value produce cool, blue light for a more energising mood and are ideal when you need to perform tasks that require concentration.

Light Bulb Colour Temperature Chart

4. Watts & Lumens

Lumens and Watts

Most people think that the wattage (W) of a bulb tells you how much light it gives. However, this is not the case as wattage only measures the amount of energy required to light bulbs. Lumens (lm), on the other hand, measure the amount of light that is actually produced. For example, some bulbs, like LED, give the same light output (in lumens) as a classic bulb, but for a much lower wattage. So, to see how bright a bulb is, think in lumens, not watts. The higher the lumen value, the greater the light output.