director lighting tech. dispute. Protocol?

As a new director in this industry, I am unsure of the protocol when it comes to directing of the lighting. I thought the director had the final say on all things concerning presentation of the show.At the moment we are halfway through our production,which is being very well received by the way,but there is a dispute in the lighting. The lighting tech. insists on blacking out the stage at the end of the final scene before the final curtain, but I want the lights left up as the curtain closes.The lighting tech insists that you do not close curtains with full lights up, ever.But I have been in many shows where the lights have been left up as the curtain closes. What is the correct procedure? and shouldnt the director get the final say? Wayne.