I don't know what the draw is. I no longer boon dock so that was not my reason for changing them. For me it was about reducing the heat output. We'd sit on the couch and the lamp above would cook my head. And I have no hair, so it was not pleasant!
I can tell you that when I flipped all the ceiling lights on before the conversion my power convertor was quite loud. Now the fan runs but its just a soft whir, so at a guess there is far less draw than before. And almost no heat from the lamps now.