The base

The first criterion of your LED lightbulbs is the base. It is important to choose the right base so that the bulb is suitable for your lighting fixture. The main base types are: the E27 and E14 screws, the B22 bayonet base and the GU10, G9, G4 MR16 (or GU5.3), G24D, R7S. However, if the LED bulb bases are not compatible with your fixture, there are adapters to fit.

 

Power 

With an equal consumption, LED lightbulbs have a much higher light output than the normal incandescent ones. Therefore, you cannot really compare the brightness between them in terms of wattage in the way that we’re used to. It is better then to compare by lumens (lumen) which is an exact unit of measure of light output (luminous flux).

 


Color temperature
  

Unlike traditional bulbs, LED bulbs can emit light of different colours. These hues of colour are put into 3 categories: warm white, neutral white and cold white all measured in Kelvins (K).

 

Warm white (<2700 – 3300 K):

Warm white has a yellowish hue similar to that of the old incandescent bulbs. Warm white is hearty, pleasant and relaxing which is why it is mainly used in living rooms, dining rooms, bedrooms, etc…

 

 

Neutral white (3300 to 5500 K):

This hue is the whitest and most similar to daylight. Neutral white is ideal for rooms that require high brightness such as bathrooms, offices and kitchens. It is an energising shade of white which gives the most clarity.

 

 

 

Cool white (>5000 K):

Cool white emits a blueish light which best reflects the natural colour of objects. It is ideal for illuminating rooms that require high brightness such as attics, cellars, garages, outdoor lighting as well as shop windows and tables, etc.

 

 

 

Dimmer control compatibility

Unlike incandescent lightbulbs, LEDs are not all “dimmable”. Therefore, it’s important to know if the LED bulb is installed with a dimmable control or not because if it is not adapted, the dimmer will not work correctly. A normal LED bulb adapted with a dimmable control will only switch on and off through phases of blinking. On the other hand, a dimmable LED bulb offers a varied range of lighting intensity.

 

Light beam angle

A light beam angle basically means the field of light emitted by a LED lightbulb when turned on. An LED with a low beam angle (30° to 40°) will illuminate a small area but offers more intense lighting for the same lumen rate as an incandescent. This type of more focused lighting is ideal for enhancing objects such as tables, sculptures, artworks… but also for places that require high brightness such as kitchen worktops, bathrooms, offices…

An LED with a wide beam angle (60° to 360°) illuminates a wider area and better diffuses light. A wide beam angle suits bedrooms, dining rooms, living rooms, etc. as the light produce is softer and more pleasant.

 

Colour Rendering Index (CRI)

Colour Rendering Index (CRI) measures the ability of an artificial light source to reproduce the colors. Daylight equates to a CRI of 100 so the higher the CRI of an LED, the more natural the colour.

LED lamps and bulbs have a CRIs that can go as high as 90 although it is normally between 75 and 85.   

LEDs with a CRI>80 are mainly used to brighten housing and work environments.

LEDs with a CRI of 70 to 79 are suitable for lighting corridors, stairwells…

LEDs with a CRI<69 may be used in dark places where colours are not a priority such as a garage, cellar, basement, etc.