DO NOT DO IT DURING BUDDING. you will loose the biggest part of your harvest if they are budding now they shoudlnt be getting any taller the plants will start to put all their energy into buds. If their already too tall and getting to much heat from the lights you could suspend a sheet of glass or plastic in between the light and the top of the plant to absorb some of the heat just make sure its not touching either the light or plant. Plastic might not work depending how close you will have to put it to the light it will just melt. Oh yeah and cutting it now is bad because it wont make two new shoots it will just go into shock youll kill the biggest budding area and youll slow the buds you still growing.