LED Energie LED bulb teardown

LED Energie brand LED bulb with following data stopped to work properly:

230V 50Hz 7W E27

450lm 3000K 60mA 20D

3684 Mod.5161

So lets make a tear-down

Inside

There seems to be 20 small LEDs in series inside bulb and one of them burned black. As such this LED string is expected to need around 70V over it. LEDs were soldered to a aluminium circuit board thar was glued to aluminium tube inside plastic lamp base part.

Look at the circuit board

This looks like power supply is basically an RC current limiting (with small coil) followed by rectifier and small electrolytic filtering capacitor. In addition there are 470k bleder resistors to discharge capacitors.

The big resistor is a bit suspect here. According to color code it should be 100 ohms, but multimeter reading says 295 ohms. I suspect that either it has changed value or color code has changed colors due heating.

The RC circuit capacitor was 1.1uF 400V. The filter capacitor after rectifier was 2.2uF 400V electrolytic.

Here is the reverse-engineered circuit disgram:

107 Comments

  1. Tomi Engdahl says:

    Christmas special Turn Any LED bulb into colourful RGB light| Maryy Christmas
    https://m.youtube.com/watch?v=1I4pQi12GLw&feature=youtu.be

    Reply
  2. Tomi Engdahl says:

    Make your own Dooby lamps – DIY Dubai lamps (strobing alert)
    https://www.youtube.com/watch?v=ISTB0ThzhOY

    A test to see if ordinary LED lamps can be under-run like Dubai lamps to make them last longer with reduced intensity and heat.

    To limit the current I used different values of series capacitor, which has a soft limiting effect, making it compatible with traditional capacitive dropper and linear regulator based lamps.
    This technique does not work with some lamps with switchmode based power supplies. They will tend to strobe due to the way the circuitry works.

    This project involves mains voltage, and suitable precautions should be taken during your experimentation.

    Reply
  3. Tomi Engdahl says:

    Exploring a Chinese magnetic “machine light” (with schematic)
    https://www.youtube.com/watch?v=UDrQ5aiCdJg

    Specifically sewing machines, but it does have other uses where you need a splash of light.

    By Chinese standards it’s actually quite well made and functional. The circuitry is good and the LEDs are an interesting type being run at a sensible level that will ensure a long life.

    This seems to be designed for Chinese factories, so I think it’s only available in 220V. But it will still light on 120V.

    Reply
  4. Tomi Engdahl says:

    Bodging a repair on a faulty ground uplighter
    https://www.youtube.com/watch?v=4goqsDGro7w

    This is a faulty ground recessed uplighter that was sent for our exploration by Douglas.
    It’s a classic example of premeditated landfill, with no replaceable lamp and a sealed case to try and stop water getting in.

    They are often mounted into a buried enclosure to ensure that anyone who works on them has to kneel on wet ground and fumble in stinky water to try and make a waterproof connection onto a cable that gets shorter every time a fitting is replaced. They’re usually powered from panels where all the RCDs/GFCIs have been bypassed to “fix the tripping issues”. (Not a good thing.)

    You can see this type of light littering the pavements of cities and “architectural” areas. They either shoot light pointlessly into space while dazzling pedestrians, or put blotchy skidmarks of light up the side of buildings. They are notable for flickering gently as their corroded LEDs light the internal drops of water on their lens, and occasionally emitting steam from their submerged electrical connections.

    Reply

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