Probe-Start lamps are NOT compatible with electronic ballasts. 

Using a probe start lamp in an electronic ballast will increase chances of lamp & ballast failure.

50/60Hz Probe-Start metal halide lamps should not be used on high frequency electronic ballasts. It is improper for an e-ballast to ignite a lamp through a probe, as the circuitry was not designed this way. 

Pulse Start MH and HPS lamps do not start like this, they require a 4k ignition pulse from an igniter or electronic circuit.

(this is what the MH/HPS switch does on a switchable magnetic ballast, it either keeps the igniter in the loop, for pulse start or HPS lamps, or takes it out for probe start)

Running the proper lamps with your digital ballast will ensure longevity & optimal efficiency.

 Click Here to learn more about proper lamp and ballast circuity.