im all for greener ideas..but..as someone already wrote the energy efficient dont give off heat..(( ive already tried ))..i buy the 60 & 90 watt bulbs.. i use a wooden box & use a old screen window to fit over box opening..drap a cloth over it to keep in heat...afixed a dimer switch socket to it...can adjust temp as needed...as box stays warmer in hot summer months can turn heat down with dimer control....cooler days can adjust to keep chicks warmer.....few friends & amish guy all use kerosene heaters...no worry of electricy..but not sure if either of these are "green" ideas.