Mh to flower is wrong. I have tried it myself (even though I knew better) and MH did flower the bud but it was not the same color or as potent as the same strain of plant under HPS. The trichomes were smaller under MH for flower VS the same strain flowered under HPS.

Now I have one room that has only HPS (2)hortalux (2)standard HPS just to mix up the color. The plants are growing great, no color shift in the leaf, no problems with stretch, no problems with growth being stunted. We will see but I don't expect the flower cycle to be any different.

IF this holds up like I think it will, I have (4) 1000w and (4)400w Mh transformers for sale......lol