Installing LED lights the most affordable and simple ways to reduce your energy consumption.
LED bulbs are up to 90% more efficient than conventional lighting systems. Replacing a typical halogen 50W bulb with its equivalent 5W LED light can save you around £10 per year (assuming it’s on for 5 hours a day), for one bulb! Typical house savings of over £150 per year are common and in larger houses or businesses with dozens of lights the savings can be several hundred pounds per year or more.
The payback time for an LED replacement installation can be as short as ONE year for some commercial locations and 2-4 years for smaller business and houses.
LED lights really are a no-brainer, payback times are under 5 years versus a lifetime of 20 years. This works out at a 25% ROI purely through electricity savings.
Want to calculate your savings? Download our spreadsheet to work out how much you could save by upgrading to LED’s
Up to 90% more efficient than conventional lighting
The savings of a LED over its lifetime come from both the reduced energy savings and reduced replacement cost since they last so much longer than other types of lightbulb. The first part is very easy to calculate, and the formula is:
Bulbs last up to 16 times as long as their halogen equivalent
Unlike incandescent or fluorescent bulbs, LED lights do not suddenly stop working when they reach the end of their life.
Instead, they eventually start to get dimmer. The industry standard is to use a value of 70% output as the end of life, as this is when it becomes noticeable and the bulb needs replacing. The lifetime varies a lot between manufacturers and bulbs, but as a rule of thumb a value of 50,000 hours can be used.
Compared to halogen bulbs which last around 3,000 hours, this means if you do not upgrade to LED you will need to replace your lightbulb 16 times before someone who switched to LED would have to replace theirs!
Even compact fluorescent lamps (CFL’s), which last around 10,000 hours, would need to be replaced 5 times before an LED would. LED’s are roughly twice the price of halogens and CFL’s, so as soon as you need to buy your first replacement halogen or CFL you would already be at the stage where you were better off buying an LED in the first place. However, it is not only the cost of buying the bulb that needs considering but also the cost of replacing it which can be considerable for lights that are inaccessible e.g. a warehouse.
Higher efficiency means less energy wasted as heat
One of the reasons LED lights are so energy efficient is because they emit hardly any heat compared to halogen bulbs, and significantly less than CFL’s still. In CFL’s, the filament temperature can easily reach over 2,500 degrees celsius, with over 90% of energy emitted as heat. While it is true that heat emitted from your light bulb contributes to space heating, it is false to think that this will save you money on your heating bills for two main reasons:
So as well as reducing lighting bills, switching to LED can also reduce refrigeration and maintenance costs!
Robust materials with no toxic components
Halogens and CFL’s have a glass enclosure which as we all know is very fragile and prone to damage during transport and installation/removal. For CFL’s in particular this is a very serious problem because they contain mercury which is extremely toxic to both human and animal health.
LED lamps are usually encapsulated with a polycarbonate diffuser which make their transport, handling and storage a lot safer and less prone to damage.
Case Study 1
|Example 1: Kitchen with Downlighters|
A kitchen with 8 x 50W GU10 halogen downlights on for an average of 5 hours
per day are upgraded with 8 x 5W LED replacements. Electricity costs 14p/kWh.
5 ( hours/day) x 365 ( days/year) = 1825 hours/year
1825 hours/year x 0.13 (£/kWh) x (50-5)W /1000 = £8.01/year/bulb
£8.01/year/bulb x 8 no. bulbs =
Remember this is only the kitchen! If you repeat this for every light bulb in the house you can find the total savings which can easily reach 3 figures for a family home.
Case Study 2
|Example 2: Commercial Office|
|As another example, take an office that is open from 7 am to 6 pm, 5 days a week for 250 days/year. If they currently have 72W fluorescent tubes and replace them with 40W LED panels, assuming a price of 11p/kWh and there are 100 lights, the savings will be:
11 ( hours/day) x 250 ( days/year) = 2,750 hours/year
2,750 hours/year x 0.11 (£/kWh) x (72-40)W /1000 = £9.68/year/light
£23.10/year/light x 100 no. lights =