Does this unit come in redwood? Advantages of hemlock vs redwood? Do you have independent tests for VOC's and EMF's I could see and read? My wife has a lung condition and I have to be very sure it is all safe for her with off gassing etc.. I would like to purchase before 11/19/15 if can be satisfied with your information on this unit. Also what is the difference between a unit that has multiple wave lengths with the unit and single short, long or medium wave lengths? Thank You, Steve Anderson