yes if you run the sunaquatics bulbs on the sun aquatics ballasts the bulbs work great, they also work great on any other electronic pulse start ballast as do other bulbs in the industry, I am aware that alot of people have been running cheaper non electronic, non pulse start ballasts. Eroupean style metal halide bulbs are designed to be run on a pulse start ballast, some run them on other ballasts with good success, some have problems, hardly the fault of the bulb. Bulbs that have burnt yellow for a customer and were sent back to us have been fired on a "proper" ballast, and the bulb works perfect. Its kind of like buying a new car that runs on a certain type of oil, if you use the wrong kind of oil you end up with a broken down car. In my opinion, the sunaquatics 10K appears to be more white blue than the ushio, just by a hair.