Sick babies or worried parent?

[JRegan420]

These plants spent the first 4-5 days of their lives under 2 150watt HPS lamps...then I switched over to CFL yesterday. I noticed the ends of the leaves on 2 of my 5 plants looked a little darker...almost a deep deep purple. Is this some sort of stress from the light change? The water being used has a 5.6-6 ph and the rockwool was presoaked to the correct ph as well.

how far away from newborn plants should I be keeping the lights?
*6 26watt CFL with a total of 9660 lumen.

and the other

 

[JJ Bones]

What's your rooms temperature? How cold is the water when you feed?

 

[JRegan420]

room temp is 74 dgrees and water is 74 also. it was light burn...they are on the road to recovery now. you can see them in my journal