Wow, hang on hang on.

You need a HPS. IF that is a HPS why is the light white? The spectrum of a HPS is orange/red. That isnt.

Also, if that was a HPS it would have burned your plants like a blow torch by now.

From those pics i can quite safly say that isnt a soduim bulb, and i can also safely say that its not the right spectrum either, or lumen output.

Your seedling shouldnt be stretching.

Get some CFL's and read for gods sake, you NEED to read.

Never use ferts untill at least 3 weeks in, and expect the first 2-3 weeks to be slow, as the roots are establishling themselves/