DC Incandescent Bulb

I've just got it!

No, not STD's, why some any posts are way off, there's no light on at the end of the tunnel, so it's the blind leading the blind.

For Christ sakes someone invent a lamp/light bulb that works, or i'll never see to pee straight again.

Since the filament is purely resistive and its resistance for all practical purposes will be the same (884.6 ohms) regardless AC or DC current used.

The only thing is at 220V it'll only give @55W instead of 60W that in your case won't make much of a difference, will it?

Dear Friend,

Yes. You can use 230 Volts 60 W bulb in 220 Volts DC. Ordinary Incandescent Bulb emits light on acccount of HEATING EFFECT of the filament.

DHAYANANDHAN.S

To remind all, the value of AC voltage measured with a reasonable meter reflects the "work" that a DC voltage of that same value can do.

If we take the example of a light bulb marked as being 230 Volts, it can have either 230 Volts AC or DC applied to it and will be of exactly the same brightness with either - no difference whatsoever......

The measured AC voltage is called the RMS value, 0.707 of the peak value.

The OP can read up on this here:-

http://en.wikipedia.org/wiki/Alternating_current#Mathematics_of_AC_voltages

But whereas the DC voltage will (should) be of a constant value, the AC voltage varies at the "speed" of the frequency. Usually 50 or 60 Hz..

Therefore when it is at a low value, or even passing through the zero line, no work is being done, though the speed at which a light bulb filament can cool down is relatively so slow that it is not even noticeable.

A LED can switch on and off at the low frequencies used and some people can actually see it or even be affected by it......Especially some bad PC/TV screens can effect people badly who are sensitive.....

In the light bulb, it "averages" out the power dissipation, maintaining for the average human eye a fairly constant value of illumination....

In the link you can find this:-

Power and root mean square

The relationship between voltage and the power delivered is

where represents a load resistance.

Rather than using instantaneous power, , it is more practical to use a time averaged power (where the averaging is performed over any integer number of cycles). Therefore, AC voltage is often expressed as a root mean square (RMS) value, written as , because

For a sinusoidal voltage:

The factor is called the crest factor, which varies for different waveforms.