very bright but contained light, unmoving

My girlfreind and I were on our way home from the garlic festival in arlington and once we were east of stanwood, we saw a rather large light, we were traviling, so at first I thought it could be plane or something traveling at us since there were no blinking lights of any kind. but whene we pulled over and stopped we saw that it was not moving at all, if this thing were a helicopter, why was it staying so still and so high? and the light must have been 5 times the size of the copter, I,d never seen such a bright yet contained light. we also noted that there was no tower or any thing like that in the space this thing hoverd abouve
Date is approximate.  PD