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"60 watts" means "60 joules every second". That's what a '60 watt' bulb is

designed to consume.

If you put 100 joules of energy into a light bulb, 100 joules of energy are going to

come out of it, one way or another. Either that energy will be converted into light

and heat by the bulb's filament, or else it won't get consumed at all, and it'll come

out the other side of the bulb and still be available for use in some other device.

So, comparing output energy to input energy is not an effective way to evaluate

the efficiency of a light bulb.

What you need to do, in order to compare the economy and effectiveness of light bulbs,

is to compare LIGHT output to input ENERGY.

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12y ago

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