Will I have to recalibrate anything at all immediately after I replace my primary bulb? Asked by Dave P. On Aug 15, 2019 You don't have to recalibrate your system Once you replace the bulb. A pal was presented a rear projection 1080p Television set using a lifeless bulb. IIRC https://epsonprojectorbulblightfl13333.bloggerchest.com/36713092/the-fact-about-epson-projector-bulb-replacement-instructions-that-no-one-is-suggesting