jnabq, thanks for your thoughts. I called topbulb and they let me know that the bulb was a cheap one, but that they had never heard anything bad about it from their customers, nor did they have any returns on it. I asked her about her return policy and she said that if the bulb ever dimmed, popped, or went out in during the warranty period, I could return it for a full refund. On top of that, she said they would email me a pre-paid UPS label for shipping it back to them, free of charge. That sounded like a solid return policy, so I went ahead and ordered the bulb. I feel like there is hardly any risk there. Still, I would like to know how to find out what the original make and model is on the original bare bulb supplied to Panasonic, for future reference.