Grow room project help me!

when the seed is under the soil how far should it be from the light and what should be the cycle of the light?????

I use a CFL to get them going..you can put a CFL within 2-3 " of a seedling top..same to keep soil warm before it pops..The plant can't see light until she breaks ground; then she goes hunting for light..I keep the light on for 24hrs a day until they surface..then 18/6..I also use a transparent cup as a humidity dome..NOTE: LED Fixtures are a bad choice for very young seedlings..When they are ready..2-3 nodes in (not including round starter leaves)..I gradually acclimate them to the stronger light..Also I take the humidity dome off as soon as they break ground..keeping it on can encourage Powdery Mold.
 
What do you think about that 600w led is it better than the 300w viparspectra?
SYGAVLED 600W LED Grow Light - High Yield - Full Spectrum Indoor Hydroponic Plants Veg Bloom Panel Lamp: Amazon.co.uk: Garden & Outdoors
 
What do you think about that 600w led is it better than the 300w viparspectra?
SYGAVLED 600W LED Grow Light - High Yield - Full Spectrum Indoor Hydroponic Plants Veg Bloom Panel Lamp: Amazon.co.uk: Garden & Outdoors
 
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