u201d power the illustrated blades 104 are elongate and are in communication with the opening 96 and are primarily or completely driven by the airflow 62 the power generation system 90 also includes a transformer 106 that is located adjacent the generator 102 and that is in electrical communication with the generator 102 in some constructions the transformer 106 forms part of one or both of the generator 102 and the air diffuser 94 generally the transformer 106 transforms the ac power generated by the generator 102 into direct current u201c dc u201d power in some constructions the transformer 106 can be a separate component disposed either inside or outside of the housing 92 as illustrated by the dashed line 108 in fig2 the power generation system 90 is in electrical communication with the light sources 86 to provide ac or dc power to the light sources 86 depending on whether the power requirements for the light sources 86 in some constructions the power generation system 90 includes wiring extending from the transformer 106 along the rear wall 26 to the light source 86 the power generation system 90 also is in electrical communication with the fan 82 and optionally other electrical components of the case 14 to provide power to those components in some constructions one or more of the air diffuser 94 the generator 102.