I found this for you if it helps. They dot not come with any plug assembly but an adapter is available for specialized hard starting units. Im sure you can rig something to convert the hard wire to a plug assembly, but I am not sure exactly what you are trying to acheive. orders@lumatek.co.uk is tech support if you still need any futher info.
H.P.S/M.H - Lumatek ballasts operate both metal halide and high pressure sodium lamps. They will not light MV mercury vapor lamps which are commonly sold in hardware and some hydroponics stores.
*Please note the 750 watt ballast is HPS only.
One or two good lamps with very high strike voltages may also be difficult for any electronic ballast to light; Lumatek has an adaptor available for those lamps. Lumatek ballasts are now internally RF shielded and can be used with standard System Cord sets as available in each country worldwide.