OGgrowsanswered grow question 5 years ago Hi @ jacare111 depends on the power of your Led and depends on the state of the plant. with everything on ,your light has a better spectrum. the more light your plants receive the more they will grow both in vegetative and flowering. if it is a led with enough power growing autoflowering, you only need the vegetative light for the first 2/3 weeks and between 3/4 weeks you can turn on the two switches. good luck mate 👍