AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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.What you see depends on how the higher refresh rate is implemented and/or what settings you've made to the display. Some high frame rates insert black frames between each "normal" feame. Obviously, that probably won't look as bright initially, but you might be able to compensate by raising contrast or backlight or both. For example, 240 Hz with black frames would be frame1-black-frame1-black-frame2-black-frame2-black, etc. There would be 120 frames per sexond plus 120 black frames per second.
There might be SOME meter out there that has problems with some refresh rate or another, but I've never seen one myself. If the display in the above example measured 30 fL with no black frames inserted, if you switched to a mode where half the frames were black, you'd expect 100% white to drop to 15 fL. If you want 30 fL you'd have to experiment with Contrast and Backlight to get back to 30 fL. Color shouldn't be an issue one way or the other. And I don't recall ever seeing a display that measured differently at a high frame rate vs. 60 Hz, not that I go looking for that, but I do sometimes check things like that the first time I see a display.
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound