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Calculator Lumens Accuracies - A Deeper Look

post #1 of 3
Thread Starter 
Since there has been some debate lately about the accuracy of calculators (no problem), then I figured I would post this thread as clarification.

For the Epson 5020, according to the PJC Calculator, the Epson 5020 is doing 33 fL at closest throw for a 110" screen.
This same calculator, claims the RS-45 is doing 18fL at closest throw.

OK so maybe they didn't use the best mode on the Epson, maybe they used a Dynamic mode.
They definitely used the BEST Mode of the JVC.

They did not disclose the modes however.

My calculator is reporting 21 fL for the JVC at closest throw, and about 18 fL for the Epson, both for best modes.

I can give many more examples like this.

I am not trying to diss their calculator, my point though is very simple, if you trust their numbers, then you are comparing different modes each time you change projectors.

Just my thoughts....
Edited by coderguy - 5/8/13 at 12:18am
post #2 of 3
Yes, I do not use that calculator, for that very reason. The 5020 has been measured in best mode mid zoom high lamp, calibrated at 675 lumens. The JVC (RS45) in the same setup has measured 891 lumens. Clearly they are not using best mode lumens on the Epson.
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post #3 of 3
Thread Starter 
Mike,

Thanks a lot for the comments. My calculator will also get more refined in the upcoming versions. Right now I usually take Zombie 10k's measurements, sometimes my own (if I had a PJ), and other reviewers, I then average those 3-5 measurements and round off. So you might see 850 at PR, but like 925 on mine occasionally (or the other way around). Though generally I'll be pretty close to PR even after averaging.

I think PR and Cine usually has the most accurate numbers (though not always). Some sources measured the Epson a bit higher, but I averaged it out around 700 at mid-zoom. The numbers I posted though were for LOW LAMP, the 700 is for HIGH.
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