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SittinStoney420 Reviewed by SittinStoney420 on . Can you start to flower with MH? Hey everyone.... I have a 400w MH ballast, and a 400w HPS ballast. The HPS ballast can change up. It can take an HPS or an MH. Now, this is the deal; I have my baby girl under the 400w HPS convertable and she is almost finished flowering. And i was planning on letting blondie (plant that is veggin.) Veg until baby girl was finished and then put her in the other room under the HPS. The thing with her is she is an auto flower and is already fully trying to bud :( .Her pistils have begun to Rating: 5