1.High-Quality Lampwick : Use A+ quality lampwick, 280 Watts long-term stable light output, 4000-4500 hours long time lifetime, Only a little brightness decreases during the Entire Lifetime, continuously provide bright, clear picture. 2.Compatible Modules: Compatible with Epson ELPLP77 EB-1970W /EB-1975W /EB-1980WU /EB-1985WU /EB-4550 /EB-4650 /EB-4750W /EB-4770W /EB-4850WU /EB-4855WU /EB-4950WU /EB-4955WU /H543A /H543B /H543C /H544A /H544B /H544C /H545A /H545B /H545C /H545M /H546A /H546B /H546C /H546M /H563A /H563B /H563C /H619A /H619B /H619C /H620A /H620B /H620C /H621A /H621B /H621C /H622A /H622B /H622C /H748A /H748B /H748C /PowerLite 1975W /1980WU /1985WU / 4650 /4750W /4770W /4855WU /G5910 /HC 1440 /PC 1985. 3.Convenient Installation: Only have a few parts and have detailed installation instructions, You needn't worry about installation, we will include a pair of gloves to prevent the lamp from falling out during installation. if you have any questions you can ask our professional after-s team, they will happy to help you! 4.Quality Control: We are very concerned about the quality of our products and customer's shopping experience, All lamps we will test before delivery, If there have damage to shipped, we will resend the product to ensure the customers receive high quality products.