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1. is a common misconception/myth. even if you manage to keep the bugs out, which is really hard and expensive, you still have to deal with fungii. good luck with trying to filter out those.

2. LEDs are not more efficient than double ended sodium light lamps. max efficiency seems to be around 50%. So the other half goes to heat waste which has to be managed. climate control and especially temperature control is an issue in indoor farming.

LEDs are simpler to cool, and at this scale it might be possible to use the heat for community heating.

Yes, agreed.

But also: Frontal heat radiation from HPS is working against condensation on plant tissue, helping to achieve good phytosanitary conditions.

Everything has its pros and cons.

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