Cant find a straight answer...need some xpert advice pls.

Once her cotyledons pop out you can stick her under the light, just keep the MH light about as far away as you can get her until the first set of TRUE leaves grow in, then you can move her down. The cotyledons (which is what pops from the seed and is NOT a set of leaves) do not need a whole lot of light to grow, but they do need light to photosynthesize and grow some leaves. As long as you understand that the first set of what looks to be leaves is not really leaves, then you can follow me here.

You can either take the seeds in the rockwool cube and place them directly under the light, or you can just wait until the pop up. They will eventually pop up in the dark, but will most likely look incredibly odd because they will be pale and not green. Soon as they get light, they will start to open up more, turn green, and your true leaves will start to grow.

It is important that once the plant actually sprouts out of the rockwool cube that you start to give it some light, and that you maintain the cube being wet. If it gets dry, it will die, quickly. I could be wrong on this, but once it sprouts if you don't give it light soon, it will die from that too, so indeed make sure to give it light once she pops.

I always germinate my seeds until a root is about 1/4 inch long, and then I put them under my lights and wait for them to present themselves to the world . But, I veg under CFLs that aren't too pricy to leave on.

As far as using nutes, just make sure you wait until your second set of REAL leaves grow in before you start nutes, and 1/4 should be good.

 

ya the MH wont hurt them, but if you have a soft white flourescent that will allow them to grow through the seedling phase faster and healthier.. but if u do use the MH then u want it at least 3 feet away and 4 feet if u have enough room

 

you can use the 250 which will do very well but could burn the young seedling if it is to close but if you are thinking of getting new lights your best bet would to get a single or dual T5 you can get the dual lights for $70 or you can get the single bulb for around $30 and they do great on seedlings thats what i use on my seeds & clones and i have almost 100% success rate only a few seeds didnt sprout due to bad gentics you can soak the rockwool in nutes at 1/4 strength with a pH of 5.5-6.0 and ppm of 300-400 so you dont have any nute lock out or deficiency and idk if you using a pre-gemination method ex. paper towel or cup of water but place the seedling with tap root facing down after tap root has made a u shape that always makes my seedlings sprout really fast compared to other methods i have tried Good Luck and hope everything works out what strains are you growng??? and are you using fems seeds ?