THE DEFINITIVE GUIDE TO WHY IS MY PROJECTOR SCREEN GETTING DIMMER

Do me the favor to monitor distinction and black amount although calibrating, you bought the devices to take action if you are doing it correct.Therefore if 50% loss at 20k hrs, 25% loss at 10K several hours. Have you ever communicated with producer engineers relating to this and does it range by manufacture or maybe model? Many thanks.By subsequen