LED’s have been in our lives for a long time already. In the simplest of examples, they are commonly used in electrical appliances to signal that the unit is on – e.g. the little red standby light on the front of your TV. However, individual white coloured LED’s were never bright enough to be considered as a lighting source. The combination of many LED’s mounted together meant that the light output (measured in Lumens rather than watts) was a viable lighting source. This technology helped define the introduction of LED’s into everyday light fittings such as GU10 spotlight bulbs.
LED bulbs have a huge life expectancy in comparison to other technologies. The LED technology is very stable and so LED bulbs should last for between 25,000 – 50,000 hours. The life expectancy figure quoted on LED products related to the L70 value which is when the light still emits 70% of their original brightness.
You can save around 90% on your lighting electricity bill by swapping to LED bulbs. Yes, they do cost more than the existing filament bulbs to purchase but they will last on average for 15 years! They also produce very little heat, which is a common problem with flush mounted ceiling spotlights.
How long the LED bulbs last is calculated by the number of hours the bulbs are in use, for example if you only have a bulb in use for 1 hour per day it will last longer than a bulb on for 4 hours per day. LED bulb life is expressed in hours and typically is around 30,000 hours, which is approximately 10 – 25 years.
Watts measure how much power a lamp uses, while light output is measured in lumens. Efficiency can thus be calculated in terms of lumens per Watt. Light sources differ in their efficiency ratings, meaning that the amount of power used does not necessarily reflect the amount of light emitted. Even LED products can vary in their efficiency, and are becoming increasingly efficient as technology develops. Traditional light sources such as halogen and incandescent lamps produce light through heating a filament, so most of the energy used in these lamps is wasted as heat. LEDs product light in a different way and do not produce as much heat, making them much more energy efficient.
We can offer lamps in warm, cool and daylight white with colour temperatures measured in Kelvin (K). The lower the colour temperature is, the warmer the light given by the LED:
Warm white creates a lighting scheme that more closely matches the light given by traditional halogen or incandescent lamps, while daylight white creates a lighting effect which appears closer to actual daylight, with cool white light creating an effect that lies somewhere in between these.