It depends on the plant genetics. White Widow would have to be tied over, White Rhino same thing...any sativa strong will usually double in height in early flowering. If it is an indica, you might be okay, what about room for the light fixture?

If you trim it back it will make more shoots and more buds but keep the height under control. There is discussion about whether this method reduces crop, I think it depends on the plant. Most sativas do will with topping, indicas are a hit and miss.