That's the thing, growing them under the same light, both plants have to be at the same height ..
Would keeping the SLH at the height of the BK affect its yield ..
Simple answer is to get the most out of the super lemon haze .. it has to grow, and it's grow wont be compatible with the Bubba kush .. which is shorter by nature.
So no, the same grow box won't work with 2 plants of entirely different genetics, unless you keep the Sativa at the height of the Indica, which will sacrifice its yield.