Both bulbs output the same amount of energy. The difference is in how much of that energy is output as heat vs the energy output as light. In a standard incandescent light bulb about 10% of the energy is output as light while the other 90% is output as heat. This makes the bulb only 10% efficient. For a florescent bulb the output of light is about 50% and the other 50% is output in heat. This means that a fluorescent bulb outputs five times as much light for the same wattage as a standard incandescent bulb, hence you can get the equivalent of 100 watts of light output for only 20 watts of electricity.
To convert electric energy into light energy
A light bulb.
To have enough bulb or surface area to produce the required amount of light.
Radiant (light) energy.
A light bulb can make heat and light.
electric energy
Light and heat energy.
The function of a light bulb in an electric circuit is that it turns electrical energy into light.
Electrical energy absorbed by the lamp's filament produces thermal energy as well as light.
Electrical energy is converted into light and heat when electric current flows through the metal filament of a light bulb.
The single most important power saver product of the last 20 years is the energy saving light-bulb. They use 1 fifth to 1 third of the energy of a conventional light-bulb and last 6000 to 15000 hours compared to 750-1000.
Heat and light.