These chinese leds are lousy gadgets & fails within 2days , even when retrofitted with resistance fuse & MOV . I have thrown them to the garbage . Always use items made in your country , that may be costly , but economical in the long run .

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Maurizio
yes. because millions of LED lamps are waiting in the world to receive such services and easily we can make money and also keep the natural resources of our mother earth that is why this is serious!

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YES!

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you are welcome . yes this is true i measured this voltages by a very precises digital multi meter. also i was wonder too. but i may ask you to correct me by measuring these voltages by your own multi meter to many things are happening in Guangzhou of china that i did not know.
and thanks for your very technical comments that sending to my articles

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serious?

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Hello again Beh,

I have long ago experimented with these bulbs. I am convinced that the leds used in them are working at the verge of their electrical limits. At their maximum current in other words. Apart from that,there is not even an elementary means of protection against overvoltages, especially when they work in an industrial environment, where the grid is full of electrical garbage.
Now, when diodes are connected in series, they need to be matched. But this "has a high cost". Therefore they used accidentally selected. This renders the circuit very vulnerable to failures. There are of course countermeasures, such as the use of balancing resistors connected in parallel with each diode. Even better, complex circuits could be used including transient absorbing capacitors. These methods would render these bulbs really bullet proof. But marketing stays always in the middle. And finally they are left in their poor fate.
The cheapest trick I found, is to remove all the electronics from their base and build a transformerless power supply (using a single capacitor). There is even no need to use a rectifier. The point is that the capacitor must be properly calculated. This means that perhaps two caps will be needed in parallel. The idea is to divide the total group of diodes in two sub groups connected in antiparallel (forming something like a diac). Then connect the capacitor to one end, in series. Finally connect the free end of the cap and the other of the diodes directly to the mains. Or you can let the diodes as they are and connect a diode at the ends of the group with reverse polarity and then add the cap. If the properly calculated capacitor (X2 series, etc) provides the circuit with the half of the original current, your bulb will be practically immortal. But remember. If you do this for your customers, you will soon be bankrupt!! My greetings to you dear!

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You are most welcome WALEED.

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