I read a article in a paper,that says a tube light consumes 75 W. Please explain?

It means a tube-light consumes 75 joules of energy per second.But usually a tube light conumes still less power.

1watt(W)=1joule/second.

The power of the tube... is only dependent on the materials used inside it and it does not depend on voltage applied,current supplied etc.Whatever may be the current supply,the power remains the same.only reqirement is we have to apply adequate voltage and current depending on the power of the tube light.

Watt (W) is in simple terms, is electrical energy consumed per second by any equipment. Various equipment use different amount of power. Hence if a tube light is said to be of 75 watt,it consumes 75 Jules(unit of energy) per second.

As a matter of fact, tube lights consume less power (generally 32 W) as compared to bulb (generally 100 W).

It will consume whatever written on it if it BIS standard bulb like PHILIPS, SYLVANIA, BAJAJ, etc. If it is local make, it can consume anything.