LED bulb buyer's guide

Buying LED Light Bulbs - Alert Electrical

With the many varieties of LED light bulbs available today, choosing the correct one will seem more complicated than it needs to be. This guide to LED light bulbs will enable you to find the right LED bulbs for your application.


A light bulb’s fitting is obviously the most important aspect to get right. Fortunately, LED light bulbs are easy to shop in this respect, as they are built to retrofit existing light fixtures.

LED Light Bulbs Fitting & Cap options

If you’re upgrading from incandescent bulbs to LEDs, you won’t need to change your light fittings to accommodate the new bulbs, you just need to make sure you pick the correct cap type.

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Comparing a light bulb’s lumens output to its wattage is the easiest way to determine how efficient it is. Lumens are a measure of how bright the light is, while its wattage denotes how much power it consumes.

LED Light Bulbs Efficiency for the home

The lower the wattage and the higher the lumens output, the more efficient the bulb. Typical LED light bulbs emit around 80-100 lumens per watt, while an incandescent bulb might only give you 40-50 lumens per watt.

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Rated Life

One of the biggest advantages of LED light bulbs is their lifespan. They typically have an average rated life anywhere between 15,000 to 30,000 hours, and can even be as high as 50,000 hours.

LED Light Bulbs Lifespan whilst in use.

This is 10-20 times longer than an incandescent bulb, which only has a life of between 1,000 to 2,000 hours.

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Colour Temperature

The colour temperature of a light bulb refers to the type of white light it emits. For example, a ‘warm’ white bulb would give off a softer, yellower light, suited to living rooms or bedrooms, while a ‘cool’ white bulb would give off a bluer, more intense light more suitable for kitchens and workspaces.

LED Light Bulbs Colour Temperature options

The colour temperature of a bulb is measured in Kelvins (K) and typically ranges in a scale from 2000K-6500K.

Colour Rendering

The colour rendering index (CRI) of a bulb tells you how accurately that light reproduces natural colours. This isn’t something you need to look for in a bulb for everyday use, but it’s very important when the bulb is to be used for photographic or display uses, such as in retail displays or galleries. The CRI number ranges from 1-100, and the higher the number, the better the bulb renders colour. Anything over 90 is considered to be excellent.

Beam Angle

This only applies to directional bulbs, such as GU10s, and some downlights and wall-mounted fittings. The beam angle denotes the width of the beam of light that a bulb casts.

LED Light Bulbs most suitable Beam Angle for the home

The lower the beam angle, the narrower the light that it emits. A beam angle of 20° would be very narrow, suitable for highlighting specific objects in a room, while a beam angle of 120° would cast a very wide light, perfect for corridors and larger areas.

Dimmable vs non-dimmable

Dimmable LED light bulbs are becoming more common, but before you buy, it’s worth checking the compatibility of a bulb if you’re planning to use it with an existing dimmer switch.

LED Light Bulbs Dimmable vs non-dimmable options

The vast majority of dimmable LED light bulbs won’t work correctly if used without an LED-specific dimmer switch. They may still dim, but they might have a visible – and distracting – flicker.

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