The number mostly depends on how long you veg. A week or two of veg and plants stay small, so you can run toward six. Veg for a month and top or tie them down, and four will already overlap. More plants is not more yield once the canopy is full, it just means more watering and more chances for mould.
At 1.44 m² this size is also easy on power and airflow compared with the bigger tents. The 120x120 complete kits are a simple way to start, for example the 120x120x200 cm kit with 320 W LED.
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