You are getting some real whoppers in the tunnels!!! What temps do you keep them at? Im assuming you have an extraction fan on a thermostat to suck out or force air in when it gets too warm? Do you think the decreased light intensity inside there will result in less bud density? It would be interesting to grow some until flowering kicks in, in the tunnel and them move them outside to direct sunlight and compare the differences in bud structure that results.
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