Your Equipment:
.1) 2 150 watt "plant lights" they are my primaries, they are more blue spectrum and look like this. http://image.become.com/imageserver/...atco-s2852.jpg

I also have a 90w Halogen a few feet away from the growing area for filler and extra light, this is not the primary light.
.2) Distance from tops? The plant lights are around,eh, 5 or 6 inches away aiming at the top?
.3) Reflector type: Enclosed circular reflectors for 150-250 watt lights.
.4) Is there a consistent fresh air supply? Yes there is an air circulator that takes the air in the room and blows it back out also
.5) Do you have an exhaust fan and a circulation fan? I do have a circulation device in the wall that takes the air and blows it out whatever temperature i set it too. So yes air is circulating in and out of the room.
.6) What are the bulb wattages, kelvin ratings, and schedule? 150 watt and the Halogen is 90w

Your medium:
.7) Specific brand and type of soil: My diesel plant is planted in potting soil with a mix of top soil and i have added perlite to it. But soil is definatly not my problem as my diesel is planted in potting soil mixed with top soil and perlite, as my other mature plant is planted in all potting soil, and my baby is planted in seed starting mix from Jiffy. All different soils but are all suffering from the brown tips and lighter green leaves. My potting soil is from Schultz and the seed starting mix is from Jiffy.
.8) 5 gallon pot
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? Nope.

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting? Tap, but i do not alter the ph, the water comes out of the tap with a ph of 6.7
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...) I dont have a ph test tool.
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule. I have not fed my plants since the day i noticed the brown and yellow tips and leaves.
14) How often are you watering between feedings, and how much per watering? I water every 4-5 days and maybe 1/4 of a gallon of water every time for each plant in the big pots. I dont know how much i water my seedling, since its in a plastic cup i just water it from the tap.
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...) Nope
16) Are your ph levels stable, or do they fluctuate? No clue.
17) What is your ingoing water's ph? ...your runoff ph? The water comes out with a ph of about 6.6 or 6.7 and i dont know what the runoff is.
18) Do you foliar feed? If so, with what, how often, and at what time do you spray?

Your growroom:
19) Indoors or outdoors? Indoors
20) What size of closet, room or hut? It is a relatively small room, its about a 12x12 room in the basement.
21) What are the temps and humidity levels while lights are on? I usually keep the temperature anywhere from 74-77 degrees Fahrenheit and i dont really change it when the lights are off. And i dont know about humidity levels.
22) Have you seen signs of insects in the growroom? Nothing major i saw a few little white bugs in the soil a while back but i dont see them anymore. Everytime i saw them i sprayed with organic plant safe pesticide.

Your strain:
23) What strain are you growing? My wonder plants are indica dominant and my Diesel plant is sativa dominant.
24) From seeds or clones? Seeds
25) Is this an autoflower strain? Only the wonder is autoflower