I used a combo of MH in the beginning and switched to HPS for flowering, a grow im working on now will actually end up seeing all three kinds of bulbs as I have just started some seedling under an led. Ive researched that using a mix of MH and HPS is the best way to get a full spectrum across to the plants over the course of their lifecycle and the Led im using is only for seedling and early veg and features a pretty well balanced spectrum itself.
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