Had a mate go through the same thing a while back. Plants in a shed. Ran his lights overnight and swore he had no light coming in the tent during the day lol. Removed the carbon filter mid flower, didn't really think about it and reveg set in hard.
Was scratching his head for ages and I popped out to see no filter and short ducting. Was obvious light was making its way in the duct and past the fan when hed have the big shop lights on during the day. There's a big 150w shop light right hear the tents and he'd pop out regularly and fire it up during the day.
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