Frequently Asked Questions 

What are LEDs?/ How does LED lighting work? 
LEDs (Light Emitting Diodes) provide a different way of producing light. They produce it through the use of a semi-conductor that emits light energy when an electrical current is passed through it. LEDs are a cost effective, energy saving, environmentally friendly alternative to incandescent, fluorescent and halogen lighting. 
How does LED lighting differ from other lighting? 
LEDs differ from traditional incandescent light bulbs where light is produced by electricity passing through a filament. This is an extremely inefficient method of lighting as most of the energy is wasted in producing heat rather than light. In fact they lose 80%-90% of their energy in heat. 
The other alternative, regular energy-saver bulbs, called Compact Fluorescent Lights (CFLs), pass energy through mercury vapour to create UV light, which is then absorbed by a phosphor coating inside the lamp, causing it to glow. 
Mercury is toxic so broken bulbs have to be dealt with carefully and compliance with recycling procedures is essential. CFLs take a little time to warm up and reach full brightness. 
LEDs contain no burning gas or filaments, so they are longer lasting and generate little to no heat. Since they do not have fragile filaments, LEDs are more durable and if an LED lamp is broken, it contains no toxic mercury to pollute the environment. 
In addition LEDs cut energy usage by 85%. 
What is the lifespan of an LED? 
LEDs have an average rated life of 50, 000 hours. In comparison, incandescent lights have an average life of 1,200 hours and CFLs of 10,000 hours. Switched on for nine hours a day, every day of the year, incandescents will need replacing within a year, CFLs within 8 years and under the same conditions, an LED lamp can last for more than 25 years before it will require a replacement. 
Are they really eco friendly? 
Toxin free LEDs are energy efficient, consuming 6-8 watts in contrast to the 60 watts required for an incandescent and 15 watts for a CFL. 
By replacing existing lights with LEDs, a building can reduce its carbon footprint by up to 90% but the environmental benefits extend further than a reduction in power usage. As LEDs have a much longer life than alternative forms of lighting, less power is needed for manufacturing and there is less waste produced. For 30 LED bulbs, this results in carbon dioxide emissions being 451 pounds a year whereas the same number of incandescent bulbs and CFK bulbs have emissions of 4500 pounds and 1051 pounds respectively. 
Are they cost effective? 
As LEDs consume significantly less power than incandescent lights, they can reduce your energy bill by up to 90%. Additionally, maintenance costs are significantly reduced as LEDs’ long life and reliability saves both money and time that would normally be spent replacing broken or burnt out lights. You can find out exactly how much you would save by filling in our lighting audit and report. (Link needed here) 
Will an LED light turn on immediately? 
Yes. Unlike CFLs which can take up to a minute to “warm up”, LEDs achieve full brightness almost instantly. This feature is not affected by low temperatures and means that they are ideal for use with motion and light sensors. 
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