Indoor When to move seedlings under HPS?

[TheJoker]

Have raised the lights a bit so they can stretch if they have to. Thanks again! [emoji38]

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[Passel]

You can start using HPS once it has 3rd level leaves. Use dimmer to dim it as 400w will be too much for such a small plant. If you don`t have dimmer, raise it high enough that you don`t feel heat from bulb after holding your hand on top of canopy for 30 sec.