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Total noob here. I'm an expat and want to do a little indoor cloning & vegging here on the Caribbean coast of Central America. Air temps vary between 29ºC - 31ºC (80ºF - 90ºF) and humidity varies between 70% and 90%.

I have set up a grow room 12.5' x 12.5 feet (about 1400 cu ft or 40 cu meters), painted flat white, lightproof, and a friend has loaned me two 600 w HPSs (one digital, one analog), and a 400 w MH. They all have round parabolic reflectors (not vented). I've installed two vent fans that are each rated at moving 85 cubic meters (3000 cu ft) per hour, and two inlet ducts.

Of course, the room is getting like an oven. With just one 600 w HPS the temp is around 93ºF. I've currently just cut back to just the 400 w MH and have it off for the 6 hottest hours of the day, and the temp is around 83ºF now, but of course I'm in a pinch since I'm ready to transplant about 40 clones.

Questions:

Does anyone here have experience with indoor growing under tropical conditions? Any tips or suggestions from your experience you could share?

I imagine it's not going to be possible to lower the temp sufficiently without air conditioning (?)

Perhaps I should consider using LEDs instead to control the temps instead of artificially battling against the already warm air entering the room (?)

Any other insights or suggestions - I'm all ears and extremely grateful...

Hasta próxima from the jungles of Central America....

Hola amigo,welcome to stonerforums.
I lived in South Spain and grew indoors,hot temps can be batteld with co2.
There are a few ways to do add co2 with homemade soloutions but is better to get a regulator and bottle so you can get it dialed in.
Eco technics sell Co2 supplies.
Air vents and plenty of intake as well as oscilating fans are needed too.
I would downgrade your veg lamps to cfl's to lower heat,they put out much less heat while not loosing out on spectrum.You can get bulbs for veg,250 was fine for me.
Hope ive helped,I never used co2 and still got great results with a few good intake fans and cfl's,the big ones too,all the best with your growing adventures.
There's always someone here if you need help.
All the best.

You could'nt of got better info out of a book, Good info HYDRO!

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I don't know if you want to give this a try or not but it worked pretty good for someone I know. He blocked off all vents for his a/c except one room, which forced all the cold air into that room. He then had ducting hanging down in the middle of the room almost down to the floor that sucked that cold air into his grow room.

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