Double Gorilla!

Hello, congratulations for your excellent indoor. I wanted to know if you can help me to solve some concerns of my mars hydro fc300 lamp. Indoor 70x70x160, second week of flowering, average temperature between 18 night-22 day. My plants have a height between 40 and 47 cm. My lamp is at an average distance of 42 cm from most of the plants. The dial on the controller of the lamp I had it at 45 degrees of power today I put it at 50 (half power). I want to know if according to your experience the height seems correct to you? do I have to bring it closer to the plants or is it ok with the current distance? And the power of the lamp at 50 degrees is it ok or should I increase more the power of the lamp?