Grow Tent , how are you raising humidity?

[AvidLerner]

okay, I'm not a new grower but am new to growing in confined spaces ie: grow tent. Mine is a DIY 6x6x7 Ice fishing hut converted to a grow tent.
so lets set the scene
the room is a 12 x 12 spare room, tent in the middle.
I have 2 x 4" diameter passive intakes on the floor, in opposing corners.
exhaust fan outside tent pulling air from tent and venting it out the open door of the room and into the house. The window in the room is cracked open one inch to allow cool fresh air to be drawn in.
In the tent I have a 14" oscillating fan modified to sit on floor blowing straight up to the light. (it no longer oscillates).
I have a 940 watt Super ace hortilux HPS hanging vertical, bare bulb.


so, my day time night time temps are perfect 81F at hottest lights on, cooling to 72 during lights out


problem is at 81F my relative humidity in the tent is 35% and during lights out lowest temp it's rising to 50%
I'm flowering only in the tent and need to increase that humidity during lights on to 45%


so, how can I maintain a 45% tent humidity ?
I don't want to dick around with home made DIY humidity tricks unless they really work and are dead simple.
basically I'd like to hear from folks who have had the same problem and what they did to overcome it..... in a tent.

get a fog machine, they come in disks or others ->http://www.amazon.com/Eliminator-Lighting-Machines-EF-400-Machine/dp/B0006M59M6 or this ->http://www.ebay.com/itm/like/321745724608?lpid=82&chn=ps&ul_noapp=true I like the dsks myself. peace

 

[DemonTrich]

Don't get the ones with the leds in it.

 

[Tynehead Tom]

good point on getting something with no lights on it if it's going in the tent.
the one I got has a glow in the dark thing on it but no lights. black duct tape over the glow in the dark thingy and it's all good.

as an update: monitoring the room every 2 hours since lights out at 8am, temp and RH holding at 70.4F (lowest 69.1F) and RH 55%. exhaust fan is not on but the 14" fan under the halide is on (stays on it's lowest setting 24/7)

I lit a doob and held it near the passive exhausts (2) and observed low volume positive air flow at both , and a slight breeze out the exhaust line that I can't feel with my hand but the doobie smoke is a good "wind" indicator LOL

Gotta say, this whole grow tent idea is "growing" on me daily LOL I'll be honest, I have been a skeptic all these years until I joined this site and have found countless examples of spectacular grows and yields inside confined spaces. Can't wait to get these plants sexed and the buds rockin

 

[Muleskinner]

FWIW my plants are routinely in 35% and below humidity and it never caused any problems. I used to get excellent yields & potency with the whole grow occuring well under 35% humidity. Organic soil.

 

[Tynehead Tom]

so I've got it dialed I think.
the use of this tent is temporary. I'm only using it to grow some quick birthday bud and to test Ustad seeds shiskaberry 3. The main reason I'm concerned with humidity or lack thereof , is the plants were not liking humidity down around 35%. Bumping it up has definitely resulted in the plants responding positively. My favorite plant in the room, which looks like it will be a male, and stinks like crazy of old school late 90's shiskaberry, was suffering, all other aspects of the grow from nute strength, ph, medium ph and moisture levels have all been excellent. So the "sick plant" look with leaf edges on old growth rolling down and new growth taco'ing , caused me to look at environment over other causes of deficiency or other plant stresses. So far after a couple days monitoring and keeping temps/humidity in check, symptoms are rapidly heading to non existant.
Now that I've got everything set and working, I am currently able to achieve 84F/47%RH lights on and 74F/57%RH lights off with the floor circulator running and lung room baseboard on during lights out, off and window open during lights on . this will work for me. Might even look thru the barn and see if I still have my C02 set up but don't want to complicate this run.
I'm building rooms in my garage but doing it right takes time and figured the tent could give me a quick crop before the birthday . Here's hoping