The new Hamilton 20k was formulated to look like Radium 20k to be used on a "normal" 250w ballast instead of m80. This was done with purpose. The new Hammy 20k does look very nice in every SE wattage. I have some of the new Hammy 20k - if they can be driven on m80 and some of the things in the works never come to light, then there is your Radium 20k replacement. I have not tried to drive them on m80.