Ultra dark room with air con


I have a room that is ultra dark, no light can get in at all. The room has a reverse cycle air con so I can keep the temperature stable.

It is 11.5ft x 11.5ft x 9ft or roughly 3.5 m x 3.5m x 2.5m

I am just starting out and have hardly any money to spare (at the moment anyway).

My thoughts are 2 plants and string up a 400 watt HPS / MH Digital Ballast Reflector over the top and maybe stick a fan next to them.

Then later when i have the $$ I can get a tent and all the other bells & whistles I need.

Will this work ok?

Thanks for taking the time to help.


If it’s that dark, I wouldn’t worry about getting a tent later on. I have my tent wide open and in a room that has plenty of light leaks. I’ve never had a problem doing this. No Hermies…period.


I would go for a 600 w if you can. You’re going to lose a lot of light to the sides so the bigger the light the better. Good luck :sunglasses:


I’ll second what @Davyg said and add this:

Is the ceiling in your room made of a material you can put staples or thumb tacks into? If so, you might consider buying a roll of reflective mylar and hanging it from the ceiling, making a reflective surface around the sides of your plants.



The strains you select might effect how big of a space you make, but with a 600 watt lamp, I’d suggest making it 4 feet by 4 feet. Of course, since you would be making your own grow space with the mylar, you could even make it circular if you want.


agree… i took my big tent down and just use the room it was in… so much better this way…


Hey thanks, what a great idea and yep will get the 600.

Perfect, thanks mate.