For older model projectors (prior to year 2002), most lamps were rated approximately one thousand hours. The lamp's life however is affected by many things such as the air filters being cleaned regularly, ambient room temperature, allowing proper cool down time after use, also if the projector is moved while operating, the lamp is placed under abnormal stress and this reduces its life span. So while a majority of (but not all) lamps will meet the lamp life hours specified, some lamps will fail sooner and this is part of the normal variability.

Today´s newer projectors feature lamps that may last for a longer period. Many multimedia projectors now offer two different lamp ratings in their specs. The lower number is the projector lamp life expectancy under normal use. There are also a higher number of hours offered if you use the projector in Eco-mode. By sacrificing a little brightness from the multimedia projector, you may add many hours to the life of your projector lamp. A good rule of thumb to save lamp hours is not to use more brightness than you need in any given situation. When the lamp replace light is illuminated on your projector or the projected image starts to dim it is time to consider replacing the lamp.