LED lighting bulbs look much the same but there is a difference and if you are thinking of changing to LED lighting it is worth thinking about this. You will hear stories of clever people purchasing their LED lights from reliable sources for very reasonable prices and will wonder why they cost so much from local retailers.

The number of buyers of LED chips is limited so anyone selling rubbish at high prices would rapidly run short of customers. So it is a reasonable assumption that the higher the price the better the quality. 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 important part of the LED lighting lamp is the driver. The driver has the task of converting the 230 Volt Alternating Current into Direct Current flowing at a constant number of Amps through the chip.

The Alternating Current reverses direction 50 times per 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 challenging job is to smooth these pulses into a steady current flow and this is where there is an enormous difference in the quality of the drivers.

The best will have about a 3% ripple in the power every cycle while the cheap models can have a ripple of up to 45%. The percentage is of the measure of the maximum electricity.

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. However the effect can be felt and people may suffer headaches, eye strain, or migraines. This actually was the problem with the traditional fluorescent lamps.

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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 current with the average being 700 mA. The higher current produces more heat that is not completely dissipated during the lower current supply. The heat accumulates and stabilises at a higher temperature, how much higher is subjected to the percentage of the ripple. This will reduce the life of the LED - dramatically with the larger ripples.

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Probably 90% of the failures of LED lights are caused by the driver.

The other areas where cost savings are done 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 simple way is to use your mobile camera to look at the light operating. Any flicker will show up even though it is not visible.

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

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