Mrs. AK-Bird-Brain :
Currently 0°F/-17.7°C outside, and 5 girls are still sleeping outside. The 40w bulb couldn't handle the sudden drop in temps (that's 25-30° lower than yesterday), so I'll have to up the wattage to keep the waterer from freezing, but that's all they have so far.
By the way, what happened to the bulb? Did it go out or what? Sorry for the ignorance, I live in middle TN where we usually don't see negative number temperatures.
Oh no... it just wasn't strong enough to keep the ice away...