Plain-english Guide To Installing LED Lights
It sounds obvious, but the best place to start is to work out which lights are on the most, and replace them first. In this way, you will maximise your saving.
How much light?
Light is measured in lumens, but this is too complicated to work out every time you buy a bulb. So as rough guide, if you want the equivalent of an 'old school' 100w light bulb, go for 10w, 60w – 6w, 40w – 4w. The mathematicians among you will spot a rough 10% rule. For spotlights, replace a 50w GU 10 with a 4w LED bulb.
Light temperature (colour) is measured in Kelvin (K). The lower the number, the warmer the light. Because I like a warm light, 2700K is my preference – it's like the light from an old-fashioned bulb. 3000K is less warm, and then as you go up the light becomes cooler and whiter – anything approaching 5000k will be nearly blue. Sometimes these are called 'warm white' or 'cool white'. So, depending on your preference, check the packet to make sure have the right colour for you.
Do you want to dim your lights?
You will have to pay a little more for dimmable bulbs, but they are available across the range. Look for the 'dimmable' symbol on the packet. Just a word of warning – occasionally, because LED lights use so little energy, you may need to change your dimmer switches too (ask a qualified electrician to do this for you).