Golden Jerry,golden!!!!

[chongsbuddy]

I have these plants growing in regular organic potting soil,the bigger one is doing great,the smaller ones really are too,but the new shoots are like a golden colour,I have never seen this before.I just switched from 120 watts of cfls to my 400 watt hps light.My ph is always between 6.2-6.7 and my temps are ideal.Am I making too much of this?I fert very mildly(1/4 reg stength)I do this because I dont have an ec meter.I dont water too much.Take a look at the pics and see if you can tell me what is going on!!