dude first off ud find ur answers by readin the threads on hear. that being said yes not only do they benefit but it is mandatory for indoor growing for ex 18/6 meanin 18 hrs of light mimic the long summer days and short nights which mostly promotes growth and the 12/12 which mimics the beggining of fal which causes the plant to flower
You can't grow without light schedules! All you need is a $5 timer and you're set. You need to simulate day and night so plants grow properly. The best thing to do if you want to grow is to read a grow guide and learn as much as you can before starting.