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2. List of CRT video projectors - Wikipedia

   en.wikipedia.org/wiki/List_of_CRT_video_projectors

   ANSI lumens Peak lumens Convergence Layout Notes Videobeam 1000 : Advent: 1973 [1] ... Two projectors mounted in a special pedestal allowing twice the brightness.

3. Lumen (unit) - Wikipedia

   en.wikipedia.org/wiki/Lumen_(unit)

   ANSI lumen measurements are in general more accurate than the other measurement techniques used in the projector industry. [16] This allows projectors to be more easily compared on the basis of their brightness specifications. The method for measuring ANSI lumens is defined in the IT7.215 document which was created in 1992.

4. LCD projector - Wikipedia

   en.wikipedia.org/wiki/LCD_projector

   An LCD projector is a type of video projector for displaying video, images or computer data on a screen or other flat surface. ... (ANSI) lumens. ...

5. CRT projector - Wikipedia

   en.wikipedia.org/wiki/CRT_projector

   CRT projectors require far more time to set up and adjust than LCD and DLP based projectors. Absolute ANSI brightness achievable with CRT projectors is lower than with comparable lamp or laser illuminated LCD, LcOS and DLP projectors. As an example, the brightest CRT projectors for home use were capable of 1,500 ANSI lumens.

6. Video projector - Wikipedia

   en.wikipedia.org/wiki/Video_projector

   A projector in a standard form factor: The PG-D2870 projector from Sharp, which uses Digital Light Processing technology An image from a video projector in a home cinema. A video projector is an image projector that receives a video signal and projects the corresponding image onto a projection screen using a lens system.

7. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   Luminous efficacy can be normalized by the maximum possible luminous efficacy to a dimensionless quantity called luminous efficiency.The distinction between efficacy and efficiency is not always carefully maintained in published sources, so it is not uncommon to see "efficiencies" expressed in lumens per watt, or "efficacies" expressed as a percentage.