Originally Posted by ryudoadema
Is the 1500 ANSI lumens including the perceived increase in brightness from laser or LED? Forget which one. 1500 plus the perceived increase should be enough for my needs, but 1500 after would probably nix it for me.
Edit: Found it- "The brightness is based on the perceived brightness equivalent to the brightness of lamp projector". No mention of 3d anyway. I don't think LG are fans.
There's some critical information that is usually ignored (or just isn't known) when comparing "lamp based" lumens to "LED based" lumens.
MH lamps are broad spectrum light sources, so you NEVER get "pure" Red, Green, or Blue light creating your image. Even with the R/G/B (and sometimes Y) filters, you will still get MUCH broader spectrum of light hitting the DLP or LCD than is desired for pure spectral mixing.
This is not the case with LEDs... the spectrum from projection LEDs is very narrow, so when the image calls for a 23.54% Red, 71.83% Blue, 32.11% Green blend to create a given on-screen color, that is what you get.
With MH lamps, even short-term aging causes spectral shifting, so the color accuracy you may get with a new factory supplied lamp - is not the color accuracy you will always have... or indeed, probably never again.
Often, LED based projectors employ individual LED output monitoring (during power-on self-test) to correct for any minor output variances as they age... which is simple and cheap because you only test one LED at a time, with a single common light sensor.
Now, we were talking about Lamp Lumens versus LED Lumens...
Same thing applies... MH lamp based projectors spit out a lot more light than is desired, so when measured, the result is higher because of the "junk" that comes out the lens that's not desired. This is also why the projectors "white image brightness" is so much higher than the "color image brightness" rating... when you use the color wheel "clear" (white) segment, you not only get the visible spectrum, but everything else the MH lamp is spewing all over your screen.
With LEDs, the color brightness is nearly the same as the white brightness... there isn't any other light spectrum available to throw (though they do allow all the LEDs to run bright, without regard to "white accuracy"). So when you have a measured
700 lumen color image from an LED projector, you are getting 700 lumens of ACCURATE blended colors, which takes a lamp-based projector almost twice the lumens to equal the image quality when viewed by the human eye... color saturation is far easier to get with LED's.