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RE: Keeping off-grid laying hens at -40C/-40F
We have an energy efficient 40W equivalent in the barn. So no, you don't need a bunch of 100W bulbs. Just enough to give them light would suffice. We never had any issues with not enough light using a 40W. I'm toying with the idea of getting a LED grow light to see if that makes any difference. If they respond better to a more full spectrum light. But I'm not in any rush to change the light.
Brilliant, thank you! :)