there aren't any real equivalent watts, it is comparing the light output of different methods used to make light out of electricity. Incandescent bulbs traditionally produce about 15 lumens per watt of power. In terms of light output, a 75-watt bulb will produce around 1,125 lumens of light. Fluorescent bulbs traditionally produce about 50 to 100 lumens per watt of power. A 75-watt fluorescent bulb will produce between 3,750 and 7,500 lumens of light. Therefore, to get the same amount of lumens from a fluorescent bulb to equal the amount of lumens produced by a 75-watt incandescent bulb, the fluorescent bulb only needs to draw about 11 to 22 watts of power.
there no real reason to know equilalent wattage, as true wattage is used to figure out grow area