Where should my light be at height wise

Hey my first grow with real lighting n what not but my autos are bout 8-10inches tall not to sound stupid but I do raise the light with the plants right??? Keeping it at 18inches or do I lower it.IMG_20210417_085940|375x500

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You’re node spacing is super tight so you’re going to have a realy compact plant you can raise uoure light up a few inches to see if the plant will stretch out and it just allows for better airflow come flower time