The only internal physical differences between a Source Four 750 and a Source Four 575 are an extra hole in the lamp base housing housing assembly which accommodates the 750W lamp key pin, and the paint on the reflector housing.
The reflector did NOT change.
Share the ETC love! Do you think this information would be helpful to a friend? Fill out the form below to send the page to other recipients, or send it to yourself to save for future use.