what is the meaning of a zero watt bulb?how can be any bulb glow without any power consumption?
thanks

 

Sounds like a marketing ploy to me.

They might say that it's "zero power", but it would be rather too dark to see if the meter is spinning or not.

 

Marketing and advertisers lie. It is getting worse. You can't get a straight spec (even though they exist) for a stereo or computer now days. Now it is spreading to light bulbs (and will get worse still).

 

All bulbs use zero watts so long as you don't plug them in

 

A 10-15W night light bulb is commonly referred to as a "zero watt" bulb.. Its obviously not zero watts but is so low that it as been dubbed as such. It's all in the rounding.