hi, i know some people go straight with the big lights but me personaly think your just wasting electric, they cant use all the rays from the light at that age, im not saying you cant or shouldnt use it but if you do its best to start from far away and then bring it in day by day to harden the plant up, as for the colour im no expert but if its not the strong light then perhaps it needs some nitrogen what soil you using as 10 days a decent soil would still be ok