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A quick lumens question

Discussion in 'Projectors, Screens & Video Processors' started by BLACK_MAGIC, Oct 18, 2003.

  1. BLACK_MAGIC

    BLACK_MAGIC
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    As a general rule is the higher the lumens figure the better? Its just that ive seen some pj at 800 going up to about 3000 and im a bit confused to why there is such a difference between projecters.

    Thanks those that help.
     
  2. Gordon @ Convergent AV

    Gordon @ Convergent AV
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    No higher is not always better. Depends what the application is.

    The difference is because different PJ's are designed for different tasks

    Gordon
     
  3. Gary Lightfoot

    Gary Lightfoot
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    Just to add to Gordons comments:

    You'll probably find that higher lumens are for much bigger images or board room presentations (ambient light present), but lower lumens will be better for general home theater, as you'll get a better black level (if that's an issue for you) for one thing.

    With a brighter image, you can bring out image artefacts from the source, and that can be quite distracting. If you want a huge screen and set the pj far back, then a brigher pj may be more useful. If you cannot fully control the ambient light in the room (i.e cannot stop light coming in from outside), then a brighter pj will probably be necessary too, so as to combat the unwanted light that would otherwise wash out the screen image.

    What is probably more important, is the amount of light coming off of the screen - this is measured in ft lamberts, and you normaly aim for around 15ft lamberts or more, though not too much more. Historically this was to mask the 24fps that the shutter produced. Too high a brightness caused a strobbing effect IIRC. Can somebody clarify that for me please?

    HTH

    Gary.
     
  4. BLACK_MAGIC

    BLACK_MAGIC
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    Thanks i understand now:)
    I'm slowley getting there i think:)
     
  5. theritz

    theritz
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    You may find the following link informative.....


    Screen Design Guide

    Check out the section dealing with calculating screen brightness. This link is also in the FAQ............ lots of other useful info there............


    Sean G.
     

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