Ratchnick
Crowing
Shatter resistant bulbs were designed for the food industry. They are glass with a plastic coating to prevent shattering. Some manufacturers use teflon in the plastic which emits a vapor that is extremely toxic to all birds. I just read an old post yesterday, the OP lost 7 birds in 4 hours.Plastic bulbs actually are good too. They are shatter proof. I honestly never heard of ceramic bulbs but ceramic fixtures .