mars hydro ts3000, autoflowers super lemon haze Please help, how many inches high should my light be to the plant and I want to extend the harvest period f

The distance from the plants are normal to me, but it depends, apparently the light is too strong for this stage, cause she's too compact. if it has dimmer, turn down to 50-75%. if it hasn't raise it as high as possible for stretching. also the humidity is low, it should be 60-70 for two weeks plant. good luck my friend ✊