Originally Posted by mouradb
Screen size is 114. 16.9. Range on the meter was setup correctly.
My readings (top-left to bottom-right) were 17,19,17,17,20,18,16,19,17. For those numbers, the spreadsheet calculates 72 lumens peak and 64 ansi.
I don't know if it is an issue, but it seems that the throw distance does not make a difference (mine is at 16 feet)
The throw distance in the spreadsheet is not needed in the computation. I'm not sure why it is colored blue. Maybe the spreadsheet used to be used for another computation.
But the important thing is that your lux readings look very low. The lumens computation is correct. So the question is why are your lux readings too low?
What source were you using to display a white screen? Did it look like a bright white screen to your eye?
Did you have the sensor of the meter (the white part after you remove the protective cover) facing towards the projector lens? Not
towards the movie screen?
Do you think your lux meter is working correctly? If I remember correctly, the LX1010B comes with a little pamphlet that shows common lux levels for various situations. Can you check if, say, a reading light gives the expected lux reading?