Review on Zilla Incandescent Bulb, Daylight Blue Light and Heat, 100 Watt (3 Pack) by Kathy Morales

Day Blue bulbs were purchased to protect outdoor bird baths from freezing. The bulbs were enclosed in a metal platform and containers of water were placed on top. Of these three installations, only one worked, and the other two bulbs burned out within hours of their installation. I know they weren't meant for that purpose, but in this extreme Michigan cold, we'll try anything. Therefore, I do not recommend these lamps for purposes other than those recommended by the manufacturer.