With the phaseout of incandescent bulbs, the term “watts” is fading from importance. Now the word to know is “lumens” - a unit of measure for the brightness of light that a bulb produces. This watt conversion chart will make shopping easier. The wattage equivalent is still listed on the packaging of new-fangled bulbs, but can be hard to find sometimes.
150W = 2,600 lumens
100W = 1,600 lumens
75W = 1,100 lumens
60W = 800 lumens
40W = 450 lumens
SOURCE: Federal Trade Commission
HomeStyle, Pages 38 on 01/11/2014