Ceiling Lamp

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After my first project

https://www.instructables.com/id/LED-Box-Room-Lamp/

I moved onto the corridor lamp and using the same bits from the china lamp I stuck the led strips with the heat sink paste to the lamps steel casing.

I then linked the strips in series and as in my previous project used the china lamp inner's as supply.

Both this and the other lamp are now much more efficient and last way longer as they now have a heat sink to cool down the led strips.

I have also realised that no matter how many led strips I use the supply voltage changes to feed each led its 3 volts.

When I tested 36 led's the voltage measurement was 108v

With the same bulb inner circuit I then used 50 led's for this project and the voltage went up to 150v.

I don't know why but the voltage seems to increase with the amount of led's fitted.

I have also read that this circuit could be improved using a 100 ohm resistor at the positive side just before the first led strip as a fusible resistor and changing the dropper capacitor for an x rated capacitor.

This is something to try with my next lamp.

Anyone tried this before or have any experience with capacitance dropper circuits?

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    5 Discussions

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    Mark Boulton

    2 months ago

    here is the latest living room twin 70 led version with replaceable aluminium heat sinks as promised :

    20190223_191841.jpg20190225_163946.jpg
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    bhvm

    2 years ago

    It seems to be using a capacities dropper, so yes, Voltage will go up as you add LEDs. I suggest you add more LEDs till voltage reaches 200v (Assuming you live in 230v Zone). The circuit gets more efficient that way.

    3 replies
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    Mark Boultonbhvm

    Reply 1 year ago

    Always thought I would be overloading the circuit by adding more led's to it? After all the original circuit (bulb) had 36 led's.

    Tested it with 70 led's to a 36 led bulb circuit and it works fine, no overheating and a voltage of 210v (I live in a 240v zone).

    will be posting pictures once the new lamp is finished.

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    Mark Boultonbhvm

    Reply 1 year ago

    Thanks will do on the next one.

    Always thought less led's would make it safer and less load.

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    bhvmMark Boulton

    Reply 1 year ago

    A capactive dropper pushes a fixed current through the circuit. Overall consumption is constant. So Depending upon number of LEDs, Other energy is converted to Heat. Using Maximum Forward voltage (near 180~200v) makes brighter light while power consumption remains the same.