Mary,
If you are experiencing a dim image from the new lamp, this can normally be attributed with dust accumulation across the filters or within the unit itself. LCD projectors require cleaning of the filters on a regular basis to avoid this type of issue over time.
Please contact Technical Support via the web form on the knowledge base at www.prometheankb.com, select your region/ language, Projectors, Contact Us. In the Existing case field input case number 224045 and provide the serial number of the projector so that we may better assist.
Thanks!