The new lamp can retrofit the old lamp. The starting aid, is a wire around the arctube, which I don't see here, and is added because of the removal of the Kr85 from the gas filling. We have the new lamp in a cheap chinese floodlight at our hostel, and it takes about 3 mins to run-up and 8-9 mins to restrike (The floodlight have a local made Eltam magnetic ballast, and either Eltam/Chinese superimposed ignitor).