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# where the power gone small white LED based lamp

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#### vicky.pace

##### Member level 1
small based lamps

Dear all,

Here I have made a small white LED based lamp in which I have used a .39uF400v poly capacitor for droping voltage. All 10 LEDs are in series and glowing very well but what I am seeing that input current is equal to output current mean input power is 220X.02=4.4W and output 32X.02=.64W. Now the question is that where the power 4.4-.64=3.76W is going even there is no heat in circuit.
Please clear this funda if anyone knows.

Thanks
Vikram

Re: where the power gone????????

Measure the input power with consideration to the phase angle between voltage and current. The real power is V x I x Cosine of the phase angle between the first two.

The input power to the circuit is mainly apparent power.

yes you giving bad power factor there.

A million amps in quadrature with a million volts means no real power dissipated

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