What is the correct method of calculating lumens or better stated how is everyone else doing it. What is the distance from the prjector , and are people leaving out the lens,lcd, or anything else. I took luxs reading on a white screen at nine points and then took the average and X by the screen size in square meters. The lumen measurement came to about 69.54 lumens. Does this seem correct?


Regards,
Traynor

See this topic.

you can look here also:
http://www.lumenlab.com/forums/index.php?showtopic=8664&hl=
it will show you what some otheres are doing and how
its not too long and you can compare what you have to otheres I have about 7-8 peoples outputs listed there