I agree with all the other answers below, It is Phenotype/expression and lack of light, I can't add much onto the facts they have provided but have grown weed in the low LED wattage environment before with great yields. A link to my diary of that is listed below, I did run into WPM as the air flow was not the best so please keep that in mind if its an issue.
growdiaries.com/diaries/49742-dinafem-og-kush-autoflowering-grow-journal-by-m0use
Good Luck & Happy Growing!
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