Projection Calculator Pro lumens numbers any good? - AVS Forum
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post #1 of 4 Old 04-08-2012, 06:19 PM - Thread Starter
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I was using the Projection Calculator Pro at projectorcentral.com to look at lumens and the results were strange.

11'6" throw distance, 106" screen:

BenQ W6000 (12'6" throw is the closest) 37fL
Panasonic PT-AR100U 32 fL
Planar PD7150 29fL
Epson 8350 25 fL

My Planar PD7150 is only rated at 1000 lumens, yet it has almost as many fL as the PT-AR100U and more than the Epson 8350? How are these numbers calculated?
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post #2 of 4 Old 04-09-2012, 09:09 AM
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Perhaps this is explained in their What is Brightness section:

http://www.projectorcentral.com/home...age=Brightness

The Planar 7150 uses a 250W bulb and supposedly only produces 1000 lumens which seems very conservative and results in bulb/lumen ratio of 4.0. The Epson 8350 has a 200W bulb with a 2000 lumen rating which results in a 10.0 ratio. Seems odd.

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post #3 of 4 Old 04-09-2012, 12:33 PM
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There are a few factors combining that causes these discrepencies. There is some truth to the discrepency. First, some of his entries appear to be using BEST MODES and some are not, some are using more like near-best modes (which can make a huge difference) based on what the MFR estimate is. Some of his entries also have bugs occassionally, and sometimes it appears he enters the lumens based on torch modes.

That said, DLP's have brighter best modes than an LCD. The 8350's best mode is very dim compared to most DLP's, even DLP's with lower lumen ratings. This means it can go brighter in torch modes, but with more inaccurate color. PJC doesn't seem to strictly follow a particular type of brightness, although they appear to usually use a best mode or near best mode for their numbers but it often seems like they use MFR numbers as well.

For my calc, I disclose what numbers are what on the left side as to how my calculator uses those numbers, so that will give you a better idea, but as mine is still in BETA, I don't have as many units entered yet.


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post #4 of 4 Old 04-09-2012, 12:50 PM - Thread Starter
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Definitely confusing. My Planar PD7150 says 29fL, which I assume is torch mode. 29fL would be way too bright for lights off, but my projector is set to best mode and it is not that bright with lights off.

This assumption would be fine except that the fL ratings for the other projectors at torch mode are very low.
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