Ok, so what are you conditions out side of light and 12/12. BTW your 2700K bulb is fine, it is a red(orange) bulb and is used for flowering, it is also known as "Warm White." see ->
http://images.google.com/imgres?imgurl=http://www.nlites.co.uk/images/r1.jpg&imgrefurl=http://www.nlites.eu/luminaires.htm&usg=__AY1lGuC72QX7HTrw6N06_MNX4kg=&h=334&w=600&sz=21&hl=en&start=3&um=1&tbnid=oPa_h7dCJBSNJM:&tbnh=75&tbnw=135&prev=/images?q=2700k&hl=en&client=firefox-a&channel=s&rls=org.mozilla:en-US:official&sa=N&um=1
But I think it might be other factors your not thinking of.
What is the temp in the morning, mid day, afternoon, night? This is important to know for many reasons.
Too hot, it will get stressed and not grow. Too cold and it sleeps aka kinda goes into stasis and really doesn't DO anything but will look green and healthy, leaves will stay small tho and bud will severely lack.
You want a 15-20F temp difference from day/night. This will signal the plant to pack on more resin to seal itself and protect vs the cold and moisture.
**WARNING** over a 15 Degree F drop will cause any moisture in the air to start to condense on nearby metals, cool plastics, and LEAVES! this will cause but-rot or mold. You must have good airflow at night to stop this from happening, also keep your humidity in check.
During flowering you want your humidity to be less then 55% ideally. This dry air discourages fungi growth.
Some people say too dry harms them. I don't know? Never saw any evidence and there are people on this sight growing in 12-20% Relative Humidity. They just have to water ALOT it seems.
How close/far to/from the light are the plants? unless you have over a 400W you should be 12-24 inches away, if you have good airflow, cooling, cooltube, or UL safety glass between your bulb and hood, then you can lower it even more.
I run a 250W HPS and it was vented louvers, and UL safety glass and I can get it within 8 inches without stressing my plants. Any more then that And one plant will be hogging all the light and casting shadows ALL over your grow room.
What water do you use? Tap? whats the PH? hard or soft? How much how often? what temp is the water when you feed and what time of day to you feed.
Also at the "Night" phase of the 12/12 do you have ANY light on them. Light from under the door along WHITE carpet or shiny hardwood and creep all OVER the room. Try putting them in a cool, Dry closet at night and jam a towel under the door. I would also recommend putting a small fan in the room to keep it from going stale.
Do they have airflow? mary J needs LOTS of fresh air. co2 to the leaves and oxygen to the roots. does there grow are provide this? and if so do you have smell/odor protection in place? cause now that it's budding it's going to stink.
Any advers conditions that you can think of?
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Current Grow! (03/09/09)
https://www.rollitup.org/grow-journal...row-3x-hk.html