What's the worst LED fixture you have seen?
The worst I have seen is one at the beach, it was one of those ultra-cheap Ebay Corn-On-The-COB LED floodlights. The problem with it is that it has loads of glare, and had a very purple light, enough to make me think they used purple LEDs!
Could be from Amazon too, a lot of the stuff eBay sells are also sold on Amazon. Also, the phosphor probably faded away causing the light to turn purple.