I bought a cabinet from Lowes that is about 24"Lx16"Wx70"H, it's perfect for my situation because it will be going inside of my closet to keep hidden but it seems to be getting too hot outside of the closet let alone when I put it in.

I have a 250w HPS with a 4" vortex fan (170ish cfm i believe), started at 12" away then moved to 15". I do have a fan controller on the vortex because that fan is way too powerful and loud for such a small cab. Also have 3 1.5" holes and 2 1" holes at the bottom for intake. Also a 120 mm computer fan blowing under the light and for circulation.

My temps are always between 84-90 with 20% humidity, and before I built my cab the seedlings were just under my 250 watt for 5 days at probably 100 degrees, which is what I kinda think the problem is but it seems to be getting worse and the plants seem to have really slowed up.

Anyways my problem is that the Cotyldons turned yellow a couple days ago on all 5 of my White Widow seedlings and the leaves started to brown on the edges, some worse then others. Only 1 seems to be quite healthy other then it's pretty light green. I have grown in the past and by the time 10 days rolled around I was already look at a couple nodes and these guys have barely started to go.

I really don't think I need to give them fertz at such a young age so any help would be appreciated. They are almost bone dry right now and the lights are out so i'm going to water when I turn the lights back on, any suggestions would be helpful..

Thanks guys

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Your plants probably took a couple hard knocks from the 100 degree week, but it sounds like you're taking the right steps to get them well again.
Try putting ice in front of the fans. As the ice melts it'll give your babies extra moisture, and lower the temps. Don't forget that marijuana is happiest in the mid 60's temp range.
I think they'll pull through just fine, make sure you water thoroughly.

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Does anyone know what that yellowing is in the last 2 pics in my first post?

Well your cotyldons are supposed to die off now, and you should feed em lighty..1/2 strength.
The dead patch on the leaf looks like heat burn,stress- 100degrees is to hot for the tiny youngen`s try to cool the cabinet somehow, maybe mist a bit to cool em off, but watch the light does`nt burn em worse.
What is your light schedual[sp] right now?
ccb

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I`m not a breeder. I`m a seed maker

mid 60's?....WHAT????? try mid 70's omg....72-77 is PERFECT...it's ok to dip into the 60's at night but high 60's at that

They seem so young to start giving them fertz, but I guess if the problem persists then I will start giving them some fish emulsions on my next watering. I've got my temps to be about a steady 85-88. I just can't seem to get it any better then that. I think the main problem is that the cabinet exhausts into my room and heats my room up even more and it just keeps getting hotter. I was thinking about running some ducting hose from the cab right to my window, but would 10ish feet of ducting hurt the fan? Should I try some CO2?.. Never used it so i'm not sure how it works.

My light schedule is about 20/4 right now, i'm trying to give them some night time to cool off from the heat.. otherwise I would be 24/0.

Hey guys I opened my cab when I woke up and the temp said it was 93. I was shocked, and one of my little guys is doing horrible. Here's a pic, almost everything is turning yellow, does he need nutes or is it all from the heat?

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it looks dead...no nutes for about 2-3 weeks into grow...your light must be wayyy to close or its just not getting watered..plants that young should not need nutes yet.

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It's only on Day 11 I think. My 250 watt is about 13 inches from the tops of the plants and I got 2 computer fans blowing in there. It does seem to be deterriating, the others aren't as bad but seem to be catching up at a slower pace. I have a fan pumping air from outside into my room and the temps are going down to about 84-87 and it just doesn't seem to get better then that.