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actually....we're covering this in class right now.
Mh lights are great for growing anything. Yes it's higher in blue which promotes chlorophyll growth and puts on leaf...you'de be using a NPK with a higher N then P and K. for flowering...you can still use the MH..buds will be denser but not as large/fluffy. If you used a HPS durign flowering...you'd get bigger fluffier buds but not as dense. As far as flowering.
Cannabis has a critical daylength of approx 12 hours. This means as days start getting shorter and get just beyond 12 hours it will trigger flowering. You need complete darkenss and any inturption of light during the dark period will revert it back to "day" mode requiring a full 12 hr's of dark to start over.
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