AVS Addicted Member
Join Date: Oct 2000
Location: Rochester, NY USA
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ChromaPure Software/AccuPel Video Signal Generators
My meter can read in fc or lux and i took all readings in both modes just to be sure. The room was completely dark with projector a fairly long 15ft throw away so there wasn't any problems with uniformity as when it is in full wide and up as close as possible to screen (i was amazed how bad uniformity was from centre to left, right, top, bottom when i tested with projector on table as close as possible at full wide). At 15ft distance the readings were within 0.3fc of each other at any position on screen.
Yes I used the "AVS HD Calibration Disc" burned onto a blu-ray re-writable disc running on PS3 slim. I can't remember the name of the calibration section but it was the one where it shows the 25%, 50%, 75%, 100% colours and then white. I used the 100% white fullscreen one.
This is how i measured - Set pj to correct mode eg. Dynamic. Place measuring probe against screen with white dome facing back to projector. Correct?
The readings were stable and consistent and as i said more-or-less uniform no matter which position i tried on screen.
I bought the replacement bulb here:
and at the time of order (19th October 2009) there was no option of original or compatible bulb as there is now. I assume it was original because it had Epson instructions leaflet with it.
I think there could be 1000 hours on this bulb now (forgot to check exact number) but you can see from readings above how dim the Cinema modes are and always have been, so much so that i couldn't understand how other users and reviewers were recommending these modes for normal film viewing.
I just needed to be sure I wasn't just reading/calculating lumens wrong.
p.s should I have had 2000 hours or 3 year warranty on these bulbs?
I assume you did set the reference white level using the flashing bars test pattern on the AVS disc and adjusting the projector's contrast control before you measured the light output. It does appears you did the measurement correctly. As for the bulb warranty, in the USA the replacement bulbs typically only carry a 90 day warranty and the original bulb that comes in the projector typically no more than 1 year. If you are in the UK the warranty may be longer so you should check the paper work that came with the replacement bulb.
I guess the most basic question is how bright was the projector when it was new? Does it seem much dimmer now? Very few AVS members would want to use the Dynamic mode on the Epson projectors because it has poor colors and the other more accurate modes should still provide adquate light output for use on moderate size screens in rooms with good light control. I use my 6500UB on a 120 inch screen with a gain of 1.1 and I have calibrated for grey scale/color points/gamma/etc. and with 500 hours on the bulb it still is bright enough (with about 500 lumens output measured from the projector). I realize the 6500UB series would be expected to have a little more light output than your earlier model, but if your projector has always been dim (even when new) then perhaps there is a some problem with the projector itself and not just a bulb issue.
|Aemc Ca813 Peak Function Lightmeter 200 000 Lux Range 0 01 Lux Resolution 3 Accuracy|