Electric Bulb

Read a light bulb, and see what units are used. Watts is consumed electrical power; lumens is light output.

Consumption.

When I was young (In South Africa - 110 Volt DC at that stage) the output of a bulb in candle power was roughly equal to the stated consumption and the light output was indeed determined .

On newer development the relative output of the light emitter are also stated on the packaging.

It surprises me that you don't have light bulbs in Romania. That a trip to the local store that would sell them to read the package and print on the bulb.

joules/second,

The power to light the way.

Incandescent bulbs still have the electric power consumed (watts) identified on the bulb, not the amount of visible light (lumens) produced. To my knowledge it has yet to be standardized what to do for non-incandescent bulbs. Marketing puts the equivalent incandescent bulb wattage to produce the same amount of light. This is because most people do not understand units of light.

Yes there are relationships between any two measurable components. Once in a rare while are they in a linear relationship. Most of the time the relationship is highly non-linear.

nominal wattage../..nominal voltage....= nominal power usage(actual power usage may vary)
Lumens would be total light output....

I was taught P/V = I

never heard of it

Only when everything is real.

Like a lamp filament? (Ok, they're often coiled, but I suspect that the inductance is minute, and the reactance at 50 or 60Hz is insignificant).

Just out of interest, the back of my envelope reckons a ½" long filament 1mm in diameter with 50 turns would have an inductive reactance of about 6 x 10^-7 Ω at mains frequency. (Sorry for the mixed units. Some envelopes give better results than others.)

Reading this when lit can damage your eyesight.

Warning from the Chinese owned GE.

Jeez,

Can't anybody Google?

The Federal Trade Commission Labels for Light Bulb ...

Why google when you can go to CR4 and use the AskLyn search engine?

(Sorry, it's Friday, and I need to bleed off my surplus snark so I can enjoy the weekend.)

I think the confusion here is coming from the new energy-efficient light bulbs (CFL or LED), which produce roughly the same amount of light (lumens) as a standard incandescent of a certain wattage (energy consumption). For example, it may be that a 13W CFL or 11W LED bulb would produce the same amount of light as a 60W incandescent. Usually the packaging today for the energy-saving bulbs will say something like "60W equivalent."

So the answer is, the watts printed on the bulb should be the actual energy consumption.

^{I think the confusion here is coming from the new energy-efficient light bulbs (CFL or LED), which produce roughly the same amount of light (lumens) as a standard incandescent of a certain wattage (energy consumption). For example, it may be that a 13W CFL or 11W LED bulb would produce the same amount of light as a 60W incandescent. Usually the packaging today for the energy-saving bulbs will say something like "60W equivalent."}

I think that's a reasonable assumption, but an assumption nonetheless. The OP provided no useful information or explanation as to what he really wanted to know and why, so your guess, although a good one, is still just a guess.

^{So the answer is, the watts printed on the bulb should be the actual energy consumption.}

That is the answer to the question, as asked. Give the man a cookie!

Side issue: We also don't know where in the world the OP is, meaning that explaining standards for the US is likely meaningless if he is in Pakistan. I have no idea what information is printed on a lamp in Pakistan, or Russia, or Botswana...

He's in Romania. Does that make him a Romaniac?

Whàt we have here, again is a failure to communicate due to geographic, cultural and language barriers.

I wish I could shed some light on this.

Light bulb parthenogenesis?

What an idea!

Probably not; I would wager that the light bulb has been screwed. Maybe not, though -- it appears to be sporting a left-hand thread.

Hello Nandi,

Its consumption power.

Take an example of 20W bulb. 20W indicates a particular amount of current bulb will consume at a particular voltage.

Regards

Vikash

Unless it's lumens.

Many have both. LED bulbs say what power of incandescents they are replacing, and what power they actually use. Many also give the lumens of light they put out.

The rating marked on bulb indicates the consumption of the bulb but not the light power. Light power is measured in lumens which is also indicated on some of CFL/LED bulbs

The rating marked on bulb indicates the consumption of the bulb but not the light power. Light power is measured in lumens which is also indicated on some of CFL/LED bulbs.