Why is an energy-saving light bulb less powerful than a normal light bulb, but it is still as bright?

BRAINLIEST

Explanation:

As energy saving bulbs use less energy than halogens, they can produce the same brightness at a much lower wattage. Instead, you need to match their lumen output. The chart below is an easy guide to see which wattage you should be looking for in energy saving bulbs in order to match your old halogens. Energy consumption and cost  

i think it's 35 meters