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LED lighting bulbs look similar however there is a difference and if you are thinking of changing to LED lighting it is worth thinking about this. You will hear tales of clever people buying their LED lights from dependable sources for very reasonable prices and will speculate why they cost that much from local retailers.

The number of buyers of LED chips is limited so anyone selling rubbish at high prices would soon run out of customers. So it is a reasonable assumption that the higher the cost the better the standard. It is worth keeping in mind that the lower end products are produced for the local market in China and are not supposed to be exported.

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Perhaps the most critical part of the LED lighting lamp is the driver. The driver has the job of converting the 230 Volt Alternating Current into Direct Current flowing at a fixed number of Amps through the chip.

The Alternating Current changes direction 50 times a second so the first job for the driver is to reverse one cycle so that there are two pulses of electricity flowing in the one direction. The difficult job is to smooth these pulses into an even current flow and this is where there is an enormous difference in the quality of the drivers.

The finest will have approximately a 3% ripple in the power each cycle while the cheap models can have a ripple of up to 45%. The percentage is of the value of the maximum current.

The ripple will cause the light to flicker but because it does so at 100 cycles per second it is not visible to the naked eye. Nevertheless the effect may be felt and people can suffer headaches, eye strain, or migraines. This actually was the problem with the old style fluorescent lights.

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If the driver is supplying say 700 milliAmps to the LED, the ripple as it passes will supply a higher and lower flow with the average being 700 mA. The higher current generates more heat which is not completely dissipated during the lower current supply. The heat accumulates and stabilises at a higher temperature, how much higher depends on the percentage of the ripple. This will shorten the life of the LED - significantly with the larger ripples.

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Probably 90% of the failures of LED lights are attributed to the driver.

The other places where cost savings are made is by scrimping on the heat sink, wiring and connectors.

Often by looking at the finish and wiring it is obvious, but not always. A foolproof way is to use your phone camera to look at the light operating. Any flicker will show up even though it is not visible.

Many folks today are despairingly trying to find a solution to their ever increasing electricity bills. In this era it is pretty much impossible to live a cosy life without using electricity.

Before you buy a LED downlight bulb look at it working through your mobile camera. If it flickers strongly or bands move across the screen do not buy it even if it is half the price of the competition.

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