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Every light source from an LED to a simple wax candle has a beam angle. A beam angle is a measurement of how the light is distributed. GU10 LEDs and recessed downlights have a fairly narrow beam of around 40 degrees, anything within 5 degrees is classed as a medium beam.

A wax candle or traditional light bulb would have a beam angle of 360 degrees as the light shines all the way around but is less intense.

Combing brighter downlights with wider 60 degree beams allows you to space them out further, reducing the total amount of lights needed.

More information about beam angles.

Colour temperature is a measurement of appearance. Measured in Kelvins, the lower the rating, the warmer the light appears. Choosing the right temperature can have a dramatic effect on a room.

2700K - Extra Warm White

Similar to a traditional incandescent light bulb or halogen. It has a more orange and warmer tone, with a ‘soft white’ appearance. Ideal for living rooms.

3000K - Warm White

Clearer, but still quite warm. This is the ‘new norm’ for general lighting and is the most popular option. If you’re unsure I’d recommend trying this one.

4000K - Cool White

Clearer, whiter and crisp; used in commercial locations including supermarkets. Cool white appears brighter than warm white as the LED is covered in less phosphor. It can make a room appear cold and clinical but used correctly (white walls etc) it can make a room appear cleaner and modern.

More information about colour temperatures.

The sub-brand of a manufacturer that groups collections of products together.

CRI stands for Colour Rendering Index. It is a measurement of how well a light source can render the true colour of an object compared to natural light.

Rated out of 100, with an open flame or sunlight being a perfect 100. A light with 90 CRI and above would be classed as having high CRI, while 80 CRI is the standard for LEDs.

Read more about high CRI.

Warm white, cool white, what ever you prefer. More info about colour temperatures here.

Wattage is the unit used to measure the rate of energy transfer or power consumption in an electrical circuit or device.

Selecting the appropriate color or finish for your lights and switches is key to creating a unified and attractive interior. Aim to match the finish of your downlights with other elements like switches and sockets. The matt white finish is especially popular for downlights as it seamlessly merges with white ceilings. More info here.

IP (International or Ingress Protection) defines a products level of resistance to dust and moisture. The first digit is for dust and the second digit is for moisture.

Anything higher than IP44 can be used in bathroom zones 1 and 2. IP44 is splash proof and resistance to particles larger than 1mm.

An IP65 rating offers a higher resistance to moisture and is generally used outdoors. IP65 is usually specified for bathroom downlights but according to the Building Regulations, IP44 provides adequate protection.

An IP68 rating is fully water resistant and can be submersed in water, up to 1M in depth.