First time grow, advice please

Thanks for all the tips phatjay, everyone else agree to put them into flower this week?? when i start to flower them how long should i leave them in the dark before I start the 12/12, or should I just start 12/12.

the rest of them, the last one is the one that I had tried to fimm but it didnt work out thats why the leafs looked trimmed.

Well just an update, I took ur advice phatjay and kicked them into flower today is day 3 flower for them I will post pictures later today they have really started to get tall in the last 3 days, no sign of sex yet, anyone know how long before i will start to see signs of sex?

You should see signs of sex within 2 weeks of switching to 12/12.

Pictures as promised, thanks again phatjay, your grow looks really good i hope my buds looks half as good as that I switched all but 2 of my 6500k over to 2700k for flowering, its going to be a long 2 weeks I feel like I am checking on them every hlaf hour to see signs of sex lol

The rest of the crew
Ill be looking to you guys to help determine sex and telling me when to harvest cause being this is my first atempt at growing I am a noob

Can anyone explain why the yellow/browning of the lower leaves?

My initial reaction would be you need more light hitting those bottom leaves, if they do not produce in terms of photosynthesis the leaves will begin to wither, and eventually die and fall off.

But, if you are not using nutes yet, now would be the time to start adding more Nitrogen to the diet, could also be magnesium, but more commonly you see N deficiency. Start out using half the recommend dosage, I recommend Jack's Classic All Purpose, it is very cheap about $6.00 at your local nursery that carry's it, effective, and 100% organic. Eventually you will need Blossom Booster, but that is later in the game. Since you are most likely using a soil that does not have very many nutes, you may want to invest in Fox Farms Ocean Forest Organic mix, mixed with 40% perlite (miracle grow brand is good - ONLY FOR PERLITE!!)

You can find it by typing your zip code in here:

Buy Jack's Classic Plant Food -- J.R. Peters, Inc., Fertilizer Manufacturer

Good luck, post back as soon as you give it a try, let us know how you do!

On a side note:

It could be possible that it is normal for those leaves to die off, its natural, but I would still give the half strength nutes a shot.

How many bulbs are you running now and how many plants?

I have 10 23watt 2700k and 3 68watt 2700k cfl in the room right now, is that enough?