First time grower and needing a little help

This is my first plant I have tried to grow, So far it has been 5 wks and 3 days and it was looking good up to about 2 days ago. I started noticing that the tips of some of the leaves are turning yellow and drying out. I know it is not because I over fertalize it because I only use earth juice once every 7 days and i mix it as directed. I am using an 150 watt HPS grow light about 12 inches from the top of the plant, I am using 3 - 100 watt natural daylight CFLs about 6 inches away from the leaves and I am using 1- 100 watt soft white that sits about 6 inches from the leaves, The plant looks great and very healthy but my concern is why those few leaves are turning yellow, my ph levels are at 7, I water them with tap water but I am going to start today to water them with distilled water. and I water it every 2 days with 1/2 - 1 gallon of water and I let it fully drain. The tempurature in the room is set at 85*F a all times, I have a small fan hitting the corner of the room for airing out and about an inch gap under the door, and not to mention I open the door any where from 4-6 times a day. If any body could try to help me figure out why the tips of my leaves are drying that would be very helpful, Right now I am also doing 14 day and 10 night in absolute darkness. So if any body could help I would appreciate it, heres a pic of plant, you may not see the dry tips because tey are barely noticable but I wanted to correct the problem before it gets worse. If anything happens to my baby I will literally cry.. Oh, by the way it is in a 3 gallon pot.

light bleaching ,take the fluros back to 18". Also why is the room set at 85? sb 75

Ok I just moved the HPS light and the CFLs 18 inches away from the plant, thanks for your input I really appreciate it.

She looks good bro, smells good too...

Just to start off those 100 watt cfls you say you're using don't exist. They are 26 actual watts, it is comparable to a 100 watt incandescent. And two i don't think it is light bleaching, I think more than likely its heat stress. You mentioned the room's ambient temp is 85, but what is the temperature where the plant is, because with all that light focused in one spot it will be very much hotter, I bet the plants leaves are pushing 100f. But backing the lights off and maybe throwing a fan at the plant or light would more than likely fix your problem. But also get your ambient temp down like buds said.

Fuuuck she looks lovely for 5 weeks, is she flowering?

^Seems they have answered your question to.

No not yet,I just started 10 light 14 dark I am sure it will not be long from now if my leaves stop turning brown...