Friday, 16 November 2012

LED lights - are they as energy-efficient as we think?

Clearly, people at home and work are eager to ditch the unloved CFL and the not-so-efficient halogen
and slot in the small, ready-toglow semiconductor diode, be it to boost energy efficiency, cut energy
consumption or even glow a brighter shade of green.

does the LED live up to its glowing reputation? Not yet.

As one disappointed user recently wrote on a LED web forum: “I bought 12 LED GU10 lamps about 18 months ago of which around half no longer work, two only lasted for 48 hours. The light output is nowhere near what is claimed either, even using 3 by 3W LEDs does not equal the equivalent 50W light bulb.”

cheap and cheerful, matter of quality, there asre obvious issues

The disappointed LED lamp user’s comments are not unusual by any stretch of the imagination. Iain Macrae, president of the Society of Light and Lighting and global technical manager of Thorn Lighting, supplier of luminaires and lighting controls, says: “High-quality players will have great performing LEDs, tell you the truth and be able to back it up. At the lower end of the market, players have more poorly performing LEDs – quite rightly so at the price point – but
they won’t always tell you about it.”
According to Macrae, confusion exists around how light output is measured, and this has been exploited to fool the customer. Typically, two light figures are quoted by LED and luminaire (complete light fittings) manufacturers: lumens per watt and luminaire lumens per watt.
The former, lumens per watt, refers to the ratio of light output from the actual
LED to the power consumed; the higher the value, the more energy efficient

need help. feel free to ask, we'll bring samples

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