I wouldnt run any 250 watt SE bulb that is probe-start on a HQI ballast unless you want a shorter life for the bulb. Those Helios are not HQI rated.
The only HQI SE bulbs in 250 are the Radium, Ushio/BLV nepturion 10-14-20,000K (non-CWA models), Aquaconnect, and Giesemanns. The other SE bulbs are not HQI rated, and so the best you can do for them is an electronic ballast with rare exceptions.
All DE 250's are HQI though...