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That is why they come with a protective cage: https://www.breker.de/media/catalog/product/cache/1/small_image/300x/17f82f742ffe127f42dca9de82fb58b1/2/0/20-001_3.jpg https://www.breker.de/media/catalog/product/cache/1/small_image/300x/17f82f742ffe127f42dca9de82fb58b1/2/0/20-012.jpg

If you keep a safety distance from walls, bedding, chicken ladder, nest boxes, ceiling etc. it won't. Depending on the wattage you purchase some 50 cm might suffice. But you could use a heat mat or other heat source too.

What do you mean by 'flame proof'?

If you feel they could use a little warmth in the coop, use a ceramic bulb/dark radiator, it emanates heat but no light: https://www.siepmann.net/images/364190_00.jpg