Hi @BuxomHobbit! This small baby is very sensitive to heat & light stress, 600w hps is quite violent for such a young seedling. I would wait until the plant has developed at least 4 « medium size » leaves and a good rooting system, this should be done by week 2-3. For the 10-15 first days you can use a cheap led bulb, I grow my seedlings under IKEA 16w full spectrum bulbs. Hope this will help, keep us up-to-date ánd happy growing 👊
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