Red Stems ???

My plant has started to have red (or maybe purple) color on the stems. It started with the 5th node and has it on the 6th node also.

The plant is OG-Kush I believe and is about 5 weeks old in my closet. I just switched it to 12/12 but the stem color came before that.

I think I saw Zandor ask someone about red stems at one time but I did not see a response.

Is this a problem?

All else looks good and the plant is very compact and growing great considering I have a 42 watt CFL as the only light source.

thanks for any help on this,

Max Blast