LED Knowledge Bank

why LEDs? Save 50-70% on your bills

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Installing LED lights is one of 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.

A typical LED retro-fit will reduce your lighting bill by 50%. By introducing or upgrading the lighting controls (absence / presence detection, dimmers, daylight harvesting), the savings can be boosted to 70%.

 

Payback time: 1 to 5 years

The payback time for an LED replacement installation can be as short as one year for some commercial locations and 2-5 years for smaller business and houses.

Businesses can reduce this by around 20% taking advantage of Enhanced Capital Allowancesavailable for energy efficiency measures.

SMEs (small and medium enterprises) can also benefit from 30% contribution (up to £10,000) to the capital cost, available via the Carbon Trust’s Green Business Fund.

Reduced maintenance costs

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.

Note that a well designed system will ensure that the ‘end of life’ lighting level still provides sufficient light. Inevitably, the initial lighting will be too high, but this can be managed using dimmers and other controls.

Much less heat as a by-product

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:

  1. Heating by electricity is incredibly inefficient and expensive compared to the other mainstream forms of heating such as gas, oil, biomass, LPG or heat pumps.

  2. Your light bulb will sometimes be on at a time or place where heating is not required such as on a summer’s day or high up in the ceiling.In some cases heat from bulbs can be a serious problem such as in refrigerated food stores or public displays with heat-sensitive materials.

So as well as reducing lighting bills, switching to LED can also reduce refrigeration and maintenance costs.

Flexibility in design and controls

LEDs tend to allow much more flexibility in lighting design and controls than traditional lights:

  • Flexibility in size, shape and form. Wide range of beam distributions available.
  • Flexibility with appropriate control / dimming.
  • Potentially more compact in size compared with other light sources and luminaires.
  • Higher resistance to shock or vibration than luminaires containing conventional lamps.
  • Easy to colour mix, colour change and vary colour temperature.
  • No UV or heat within the light beam so can be used in areas where heat / UV needs to be avoided.
  • Can be used in cold environment.
  • Can be switched on and off frequently without reducing lifetime.
  • Instant on, no warm up time required.

Eco-friendly

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.