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[Jason McKenzie]

Tanken From http://www.pfolighting.com/aqwebsite...ombination.htm *
"The standard ballast has a transformer and capacitor in the circuit. The HQI ballast has a transformer, capacitor, and an igniter in the circuit. The pulse start has a transformer, capacitor, and an igniter in the circuit.
The European lamps work best with an igniter in the circuit.(Ushio, AB, Radium). The HQI ballast generally simulates the European ballast closer than the pulse start ballast does. However, the pulse start ballast is a lot less expensive than the HQI ballast. If you are on a budget and want the European lamps than get a pulse start ballast to ensure these lamps will fire. However, the light output will probably be reduced.
As a general rule we do not recommend the pulse start ballast on European bulbs. If you are trying to make a decision on running a European lamp on a standard ballast or a pulse start ballast, choose the pulse start ballast"

Hope this helps

J