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

The number of buyers of LED chips is limited so anybody selling crap at high prices would quickly run short of consumers. So it is a fair 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 meant to be exported.

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Possibly the most crucial part of the LED lighting lamp is the driver. The driver has the task of transforming the 230 Volt Alternating Current into Direct Current passing 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 alter one cycle so that there are two pulses of current flowing in the one direction. The tricky job is to smooth these pulses into a steady electricity flow and this is where there is a major difference in the quality of the drivers.

The best will have about a 3% ripple in the power every cycle while the cheap versions may 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 as it does so at 100 cycles per second it is not noticeable to the naked eye. However the effect can be felt and people may suffer headaches, eye strain, or migraines. This in fact was the issue with the traditional fluorescent lamps.

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If the driver is providing say 700 milliAmps to the LED, the ripple while 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 electricity supply. The heat collects and stabilises at a higher temperature, how much higher depends upon the percentage of the ripple. This will reduce the life of the LED - considerably with the larger ripples.

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Possibly 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.

Frequently by looking at the finish and wiring it is apparent, but not always. A simple way is to use your mobile camera to look at the light operating. Any flicker will show up although it is not visible.

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Before you purchase 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 although it is half the price of the competition.

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