LED filament lamp teardown

An LED Filament light bulb is an electric light bulb which produces light with a LED that is shaped as a filament. Compared to other LED lights, LED Filament lights are omni-directional and have look similar to old fashioned light bulbs.

 So how exactly those bulbs are built? Hackaday article [Mike] Illuminates us on LED Filaments gives some details. It notes that LED the strips used inside those bulbs are available in bulk from ebay and Alibaba. Typically entire strip runs best at around 75V and 10~15 mA, while putting out about 1 Watt of light. Mike expermented with those LED strips and  posted the results on his [mikeselectricstuff] YouTube channel. He also added the information to his website.


1 Comment

  1. Tomi Engdahl says:

    Beautifully simple 12V glass LED filament lamp.

    This is one of my favourite 12V lamps so far. It has the simplest possible circuitry and would be perfect for implementing a whole house 12V lighting system that removed your reliance on external power for lighting, gave absolutely zero flicker lighting and with a suitable PWM dimmer, complete dimming from 0-100%.
    Other things worthy of note. The simple circuitry means that the lamp will adjust its current according to the supply voltage and only put out its full power when a battery is being charged at around the 14V mark.


    I really wish they wouldn’t mix up voltages and fittings. E27 should definitely not be a 12V socket.

    You’ve never spent time on big ships I can tell. I’ve had E27 lamps in 12, 24, 42, and 48V in addition to the “standard” 120V.

    Still it’s a good idea to have separate standards for different stuff that isn’t directly interoperable.

    The problem is you’re assuming E27 is connected to voltage. It’s not. It’s not connected to current either. There’s a huge difference in construction between a 40W capable and a 300W capable E27 sockets even if you forget about the voltage. The trouble with “idiot-proof” things is that they only get used by idiots.

    Why do you think they’re not sold for use on boats and ships? Were you previously aware that E27 is common for 12V, 24V, 36V, 42V, 48V, 100V, 120V, and 230V lamps? I doubt it.

    “The trouble with “idiot-proof” things is that they only get used by idiots.”


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