FYI: one pot light was broken at our closing as well.
Our builder replaced it for us at no charge.
I bought some from COSTCO in the summer, $18 for 6 in a box, you may want to check there
PAR20? 螺口的,可以旋入普通灯座。
Is that a question? I don't understand what '恩对' means. They all look like this:
http://ultimatebulb.com/images/product_images/par20.jpg