What sized bucket should I use to make sure the plants stay 18 inches from the light? I would also have to take into account the height of the bucket but I'm guessing they could be upwards around 4 1/2 feet, maybe 5 if the bucket was squat enough. This will be a soil grow with Super Lemon Haze and White Widow, thank you for your input.
i would use a 3-5gal pot ant cut the lights back when they are half the height you want them to be when finished