OK! First, welcome to the forums!
1. Do they kill your plants?? No. That did happen with some tents a while back that were from Hydro Hut. See the info at the bottom of this post for more info on that. It was was a form of plastic sheeting that outgassed -- it released toxic gases into the air. So, those particular tents from one manufacturer really were killing plants left and right, but that does not condem the entire industry.
2. On the outside, look for canvas -- it'll be made with a synethic thread but it'll be strong and non-toxic. It should say in the product info somewhere that it is non-toxic. Of course, that does not mean it is, but it's a good place to start. Inside, look for mylar. Not white anything -- mylar and only mylar. Some tents are using white plastic on the inside which is not as reflective as mylar. Now, the mylar in a cheap tent is not going to be 6 mil super duper stuff, but it will work fine. I've never seen a tent with foylon, but that's about the only material that reflects more light than mylar.
3. Cheap? Ebay. I love eBay. Just search for grow tents, you'll get a ton of listings. Read! Research! Look at all the options, and decide what is best for you. Don't forget -- people are making a profit off of your final purchase price, so you really do get what you pay for.
4. Size matters. If the tent is only 5 feet high, you get 5 feet - not an inch more. Most lights need a foot or two to hang, so there goes some of your vertical space right there. Huge tents are tempting, but... venting them will be a lot more work for your fan(s) and the reflective properties of the mylar will not be so useful. If you pop a 1K watt HPS in there, mylar or not you'll have tons of lumens, and tons of waste heat to vent. On the other side, smaller footprints equal less grow room equals less ladies per tent.
5. Research. Nothing else can substitute for figuring out what people are offering for sale, what features are available, and most importantly figuring out what what it is you want to achieve.
Oh... and good luck!!
Info on HH's little disaster:
Open Letter from HydroHut to the public
In the last several months, HydroHut has been made aware of and pursued a problem with some of its Huts causing a peculiar plant yellowing leading to plant whitening in certain, sensitive plants. While the issue did not arise in all plants, or all Huts, the existence of a problem was not conducive to our product's
mission.
After several months of extensive testing, false positives and much interaction with the public regarding this matter, we have found an EPA approved compound that isn't stable in our plastic and that causes extreme stress to certain sensitive plants. In the future, this compound will be removed during manufacture.
Our focus has been directed at how to remove this compound from the plastic and to do so in a way that we could retroactively repair any HydroHut already in the field. As of February 2008, HydroHut will be repairing any affected HydroHuts at its facility. The exact process by which we repair the HydroHuts is extensive and proprietary and it will be carried out by a trainedstaff at our locations.
We fully understand that this situation with our product has adversely affected many clients. For this reason, we are standing behind our product and are offering anyone who has been affected a way to have his/her HydroHut repaired free of charge.
Any client, be they end user or store, can arrange to have his HydroHut shipped back to our Los Angeles facility for processing, free of charge. The HydroHut will then be shipped back to the client free of charge.
All inquiries for HydroHut processing should be directed to
hydrohuts@gmail.com with no exceptions.
Please provide the following details in the email:
etc, etc...
Evan Townsley
Managing Director
Further info:
HydroHuts encountered a toxic plastic issue related to some plants in their tents. The manufacturers have refused to come clean with what they did in China and asking them again for months led to no divulging of the truth. As we knew that the same machine manufactured for many brands, we assumed that other brands would come forth and admit a problem as we did, but that was not the case.
Tracking down the culprit did take several months. The culprit has been sought before, 3 times to be exact but most of those years were pre-internet days and the word did not get passed around. Let us hope that our disaster and bad fortune will now lead to everyone knowing what to look for if these toxic plant symptoms ever reappear around the world.
We at HydroHut have been well bashed for incurring this problem and unknowingly passing it on. It appeared in our product two years after we began selling our HydroHuts so definitely something was changed behind our backs, but we took responsibility.
Our recall ran most of 2008 and included arranging credit for those clients affected who returned their HydroHut to the authorized store of purchase. The recall finished on December 31, 2008. We are now selling a new, non-toxic and much improved HydroHut.
Following please find a letter with a link to the actual problem and how it was studied at 3 different points in the second half of the last century and several other links talking about the plasticizer/phthalate issue itself and those effects on plants and humans as they differ greatly.
HydroHuts USA
Oooops. I wonder how many people sued?