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For a 1m² you want about 360w Just look for a grow light of that range and use a rack to hang it. This idea you want a house lamp is ridiculous , do you understand how dangerous a growlight is if its not secure? Itl set fire to your room if it falls over

You're overthinking it. If the EC is substantially higher then you need to flush and lower EC You don't even need to check run off unless you're having a serious issue

They aren't harmful but love constant moist areas. You could pour some h2o2 in each tray if you really want to

Nothing wrong with that for seedlings. But with that type of inefficient light you need a lot more than you would compared to other grow light types.

No, You can't grow 3-4 plants with two tiny bulbs. You need 30-50w per square foot of space.

No

So yes, use what you have and when you run out go buy a 25lb bag from an agricultural store

Epsom salts is Epsom salts. As long as its not some fragranced bath type.

Are you sure it's not seeded?

That's probably 90% of your problem. Definitely revise how to grow in coco

I would of said reduce your hours to 18/6 if you had a temperature problem, but you don't

Nothing wrong with those temperatures. 27c is 80f, it's ideal

How many hours of light ? What time do they come in and go off? Are you venting the heat outside? What temperature is it when the lights are on?

He's growing in coco. The ph should be 5.8-6.2

Never used the atriums , but used lots of meanwells. Only had one die and that was about two years in. I'd say the rest are close to warranty age or past it. So I'd say it's not normal for genuine meanwell drivers to die so soon.

And are you raising temp by fan setting? Because less extraction will up your rh. Where as actually increasing the heat via increased wattage on the light will raise it and not your rh as much

Temps low. Your running a 4x4 inflower with only 375w , you'd be better off banging it up to minimum 450w , ideally 600w. That should bring your humidity down slightly, but I wouldn't be worried about it. I would be worried that you aren't lighting the space adequately to achieve the best buds

What's the question? Can you use that light to grow? No! Is it enough to keep them in their light period? Probably, but depends on the light type. I assume you had a proper grow light? Why isn't it up? What's the concerns with someone taking aerial photographs of the exterior of the...

Growing in what medium? EC is 7.3?

The vertical idea is interesting.