move from MH to hps

it will be fine, but why don't you wont to veg with mh? i did a complete grow using hps that turned out fine, (this was a soil grow) you can use your mh for the complete veg cycle then switch to your hps when time to flower
 
I agree with rnwy. Keep that MH in there for veg and switch to the HPS for flower. You can use either light for an entire grow, but the point of having both lights is to use the best light for the situation, veg or flower.
 
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