Metal Halide ballast info

[Invigor]

Originally Posted by TheReefGeek

I am also surprised that the name brand ballasts seem to get lower PPFD on average, than the "standard" magnetic M59 type ballast (not sure what brand "standard" is though!)

electronic ballasts aren't known for high performance, but for economy. Also, XM designs their bulbs to run best on probe start ballasts -- hence the better numbers on the standard magnetic ballasts. It proves that XM did a good job fine tuning the bulb for probe start ballasts.