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So if I block the light it will stop growing?

I was worried about the little one only because it stopped growing out of nowhere while her "sister" didn't have problems and also because some algae grew in it and maybe it is competing for nutrients

So what do you suggest for the smaller one if it won't grow for another 3 days?

Biggest plant is 13 days old and smallest is 7 days old and they both stopped growing and started yellowing, what can I do? 13 days old plant has been repotted 2 days ago. Is it N deficiency or overwatering? Humidity lights on is 35-40%, lights off 45-50% Temps 27 °C - 19°C Light cycle 18/6 led...

If yes, how can I remove it? I've read about covering from light source and scraping, what do you think?

In 3gal with light organic mix

Hello, this seedling is on day 8/9, is it time to repot? It looks too small to me

What about Remo Chemo by Urban Remo and Dinafem?

I'm from EU

I'm starting growing in 1-2 months, planning on doing 2/3 plants, all from different strains, in 2x2 but I can't choose what seed to buy between these: 24k by DNA Zombie Kush by Ripper Purple Punch by Ripper Gelato Sorbet by DNA Sugar Breath(do si dos x OGKB) by HSO Gorilla Breath (GG x OGKB)...

How do you fix the strips to the cookie sheet? Do you use thermal grease or pad?

Samsung lm301b has more lumens per Watt (223 lm/W)

https://www.led-tech.de/en/Horticulture-Grow-QC first one is the complete kit

Also check this in Europe https://www.led-tech.de/de/ZEUS-308-XT-High-Performance-KIT-3500k and this https://www.led-tech.de/de/CREE-CXB3590-3500K

Thoughts on these? https://www.led-tech.de/de/50cm-Alustreifen-mit-98x-Samsung-LM301B-LEDs-3500k Planning on buying 3/4 of these for a 2x2 tent, the shop suggests a MeanWell ELG-150-C2100B-3Y driver for 3 strips, what do you think?

I've found samsung 98x LM301B strips for fellow europeans, 16.90 euros each https://www.led-tech.de/en/50cm-Alustripe-with-98x-Samsung-LM301B-LEDs-3500k What do you think?

Thank you

Thank you but I don't understand what dT is, is it how many degrees can the temperature rise before it gets too hot? For example if in the growtent there are already 20-25 °C then the temperature can't rise too much.

Yes

How much do I need? Is 220/280m3/h enough? I'll be using led so the light's heat is not a problem.