I am confused what bulbs are really HQI? I know most of the double ended bulbs are not true HQI. I have a real HQI ballast but I don't know what bulbs to get for it.
I don't know any true HQI other then one made by Osram, but most bulbs can be driven at HQI if you don't mind a shorter bulb life. I think Radiums are actually designed to be driven hard (not true HQI, but operates at similar voltages).
HQI just stands for Halogen Quartz Iodide - and it's a brand name of a lamp made by Osram.
The lamp is designed to be run by a ballast that has a third component other than the basic "cap and coil" - It's some kind of soft start ignitor I think.
