LED Jargon Buster Part 1 – Definitions


led lights for home; led jargon buster; led lighting

With LED light sources and fittings lasting longer than ever before, it is important to consider carefully the best LED lights for the home and ultimately plan the lighting design from the start.

To help you get the most from buying LEDs, we have compiled an LED Jargon Buster booklet to demystify some of the key elements required when selecting the best LEDs for the home.


Light Emitting Diodes are miniature light sources offering increased efficiency, longer lifetime and virtually no infra-red or UV emissions, by using semi-conductor technology.

led lights for home; led lights; led on finger


A measure in degrees Kelvin of white light. Warm white colours are the ideal for residential applications. This can vary between 2200K and 3200K. We recommend using products at 2700K.



CRI (Colour Rendering Index) is an indication of how accurate a “given” light source is at rendering colour when compared to daylight on a scale of 0-100. The higher the CRI, the better the colour rendering ability. Good is between 80-90, superior 90+.

colour rendering; leds for home; led lighting


White LEDs vary in colour so to achieve colour consistency good LEDs are precisely selected or binned.

colour consistent;led lights; led lighting


Watts – Watts is the measure of energy consumed – W

Lumens –Lumens is a measurement of light output – Lm

Efficiency – Efficiency is the number of lumens generated for each Watt of energy consumed – Lm/W



LED fittings need quality drivers to provide a constant power to them. Compatibility of quality LED fittings, drivers and controls will ensure flicker free dimming. Speak to an expert at John Cullen Lighting to achieve problem free dimming.

best led lighting for home; led dimming; led drivers


It is a myth that LEDs do not produce heat. LEDs need quality thermal management to dissipate heat in order to maintain colour consistency, lumen output and expected lamp life.

led heat sink; led lighting; leds for home


NARROW – Can be used to uplight pillars, arches, doors and fireplaces or for pinspotting the centre of coffee and dining room tables.

led lighting;narrow beam led

MEDIUM – Can be used to light small and medium sized artwork, cabinets, cupboards or for a wider wash to a coffee table.

medium beam width; led lighting

WIDE – Can be used to wash light on curtains, kitchen units, larger pieces of art or for general light.

Head to part 2 to see how much LEDs can save you money!

wide beam led; led lighting

For a printable PDF of the full LED Jargon Buster which will show you how to select the best LED lights for home, click here.

If you would like us to send you a hard copy of our Jargon Buster booklet, please click here.