They retail for around $115.00 each, thats what PA was charging. I am running radiums now if you want to come by to see the color on an Ice Cap ballast. They are very nice, not purple at all like I was told by some people. These are bright 20k bulbs, they blow away the XM 20k in color, and they have the highest PAR for a 20K. $79.00 each at Custom Aquatic.