Metal Halide ballast info

[Delphinus]

Originally Posted by Willow

xm, hamilton, iwaskai and venture bulbs will all fire in that hood, ushio's will not.

Ushios are supposed to have a pulse start ballast (except for the 250's) but FWIW they will still fire on probe starts. I bought my ballasts several eons ago (175's) well before anyone knew the difference between probe & pulse starts and I've been using Ushios for years. They do have a little trouble firing at first but after a little while (a week or so) they seem to start fine anyhow. The only thing is it sounds like a Harley getting started. A pulse start is a much nicer start for sure, and I'm sure, much better for the lamp overall, of course.