A very common mistake is installing one light in a room. It's cheap, easy and works - but it is very nasty and will not provide good lighting. You should put a variety of lights.

When replacing lights watch out for the fact that LED lights are very directional, so you will get less lighting on the outside of the illumination cone, and much more shadow. You particularly see this in outdoor lights when people replace halogens for LEDs.

A real simple mistake is assuming that a 100W old fashioned light will give the same output as a 100W LED light.

NOOOOOOOOOOOOOOOOO!!!!!

If you put a 100W LED light in your living room, you will have stadium power lighting!

Almost make sure that in your living rooms and dining rooms, you install warm white. Lots of people have no idea about colour temperature and install cool white lights and regret it!

In terms of supplier, don't go for discount lighting that is cheap. You get what you pay for. Your lights will last many years so pay a bit more fir quality.

Indoors you will want dimming, so make sure you globes are dimmable and that you install dimmers.