View Full Version : HPS and PSMH - difference?

01-08-2010, 05:00 PM
Sorry if the question is too technical/involved for a response here, but if they both use a pulse start, what is the difference between a pulse-start metal halide ballast and an HPS ballast? I assume these bulbs are not 100% interchangeable, but is there a fairly easy explanation why not? Any web resources that might address my question?