150w hps, they havnt sprouted above the surface yet, so should I put em under lightd or do I need to wait till they sprout up before turning on the lights?
I disagree. The seed is under the soil. Put the pot under the light so when it breaks out of the soil, it will grow towards the light. Also, the light helps keep the soil a little warm. Just make sure you keep the light a safe distance from the seedling as to not burn it. Good luck!
Under the light. The soil provides the dark. As soon as they hatch, get them under the big lamp to prevent stretch. I put sprouts and rooted clones under the big lamp at "noon" so they only have a 1/2 day under the big lamp the first day. I'll also hang the big lamp higher for a day or two.
These things are designed to handle the Sun. Nothing in a cab will touch that kind of power. You can however fry plants with proximity to heat and IR. Thus the extra distance for a couple of days.
Seedlings first react to gravity.
When you drop a seed into soil the root knows which way to go.
It grows down...not left,right or up.
Just keep it wet and warm.
However once it sprouts you should follow the advice you got here.