When we think of lighting output, we usually think of watts. But this can be misleading, since watten refers to the amount of energy used and not the amount of light emitted.
To understand how much light is emitted, you need to know the light output in the lumen. Although some lamp manufacturers now illuminate the light output in the lumen, the norm is still dependent on watts.
To give you a picture of the different light outputs of different types of light bulbs, the list below gives a rough idea of how many lumens you get for a 100w bulb:
1200 lumens – standard bulb
1400 lumens – 230v halogen (GU10)
1800 lumens – 12v halogen (MR16)
4000 lumens LED lights
10,000 lumens – fluorescent
These are approximate figures that vary from lamp to lamp, but they show that fluorescent lamps can be 8 times more energy-efficient than incandescent lamps.
There is a lot of research and development within the LED sector that is currently underway with efficiency and performance improvements year after year. In the next few years, the LEDs are expected to take over fluorescence and take on the mantle to be the most energy efficient light in the home.
Some arguments that it is already the most effective because of the LED's extended bulb. See below:
1000 hours – Standard bulb
2000 hours – 230v halogen (GU10)
3000 hours – 12v halogen (MR16)
8000 hours – fluorescent
100,000 hours – LED lights
If the energy used in the manufacture of the bulb, efficiency and life expectancy is combined, the LEDs will soon become (if not already) the "green" and home lighting choices.