I was thinking about using cardboard to keep the heat in better.
Good idea because you want to keep drafts out. If you put the cardboard around you will likely only need one bulb.
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I was thinking about using cardboard to keep the heat in better.
Indoors and a cage that small, I don't think you need any cardboard at all...... and I'd only use a 40-60 watt bulb on the dimmer......watch their behavior closely to adjust the heat with the dimmer.The brooder will be indoors. I had thought about having my dad attach the lamp to the wire on the top of the cage itself so it couldn't slide. Then I had actually considered a dimmer to increase or decrease the heat, as you mentioned. I thought this would be good though, as it gives them more room to move around when they're bigger, and the edges are already rounded so none will get squished into a corner.
Can I use one of the wire rabbit cages with a plastic bottom for a brooder? I would use two lamps to make sure it's warm on both ends. I was worried about them possibly getting out through the bars (they're 1 inch apart).