Lol that is not true. There are MANY people that veg for 24 hours and get females. The only advantage of 24 is the plant will grow faster. More light = More Photosynthesis = More Growth. You are sadly mistaken if you think 18/6 will provide the same amount of growth.Also with a 24 hour light cycle, you'll end up with more male plants. Dont know why or how but its true. 18/6 is your best bet.