I made the switch to 600w 56 days into grow 21 days into bloom..

Easily the most productive move I've made , installing water chiller and room AC was good for the girls but 600w has given them a 'hard-on".. but girls don't get the woody.

The stretch had stoped.. put 600w and they took off again for another 2 inches.

Temps up 3-4 degrees over the 400w.

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Grazie, 4maggio
Experience is the best teacher.