Thank you for responding so quickly!
There are 7 of them. We have a plastic tub that's about 1.5 by 1 foot. Maybe put them in that tonight with a grate over the top and a saddle blanket underneath so the tub isn't directly on the concrete?
Or just use a regular bulb in the lamp for tonight?
Mine are the same age and the lamp bulb just went out. :/
I guess they're ready to go without, but I hate to just stop abruptly. It's going to get down to 53 F tonight and their little pen is in an enclosed tack room in the barn with a concrete floor.
Will they be okay tonight?