Shiva Shanti seedlings at 15 days old

Need some help with my babies i think?.
I am using A 200wt enviorolight for now and am using Biobuzz light mix soil.
They are about 15 days old and as you can see there is not much growth.
I did have the bulb about 2inches away from the tops but I found they are or could go dry and crispy. they are also in a propagator with the cover off and the heat on.
i have been giving them bottled water and mixed 2 drops of root stimulator with 1 liter of water. they only get a watering about every 2nd day with about 10mls. They seem a little on the yellow/brown side of things and are not lush green, there is plenty of roots growing so i dont think the problem is the soil.
Is it time for Ferts yet? Is it time to transplant?
Ithough theses invirolights are ment to be great.
Was thinking of transplanting soon and moving them in my 400wt HPSroom.
Any help would be gratfull.
Cheers,

Chef.

im not really an expert but i think the 400whps will be a frying for them id keep them under the envirolight a little more. dont give nutes yet no matter what there really small and it will burn them. you can keep them in those cups for a little longer im guessing. try to check soil ph .. i should be around 6-7 good luck