Think those compact fluorescent bulbs are not as bright as the old-style lights they replaced? You are probably not imagining it.
A guide to the amount of light given by a CFL bulb is given on its box as a comparison to the wattage of an incandescent bulb. But the European Commission says in a FAQ document this can be misleading.
"Currently, exaggerated claims are often made on the packaging about the light output of compact fluorescent lamps - for example that an
11-12-watt compact fluorescent lamp would be the equivalent of a 60-watt incandescent, which is not true."