Originally Posted by rickardl
Are there any differences using a high cell light/lower contrast vs lower cell light/higher contrast settings?
Or is it just two ways of accomplishing the same thing?
Example: Cell Light 20/Contrast 85 vs Cell Light 15/Contrast 95.
Not sure if the above produces exactly the same light output but you get the idea.
i'm about 80% sure about what i'm about to say. that means there's a 20% chance it's total BS though... you've be warned, haha.
the samsung's have a wacky contrast setting. it also affects the 10pt calibration(or maybe it's wacky because it doesn't?). essentially if you have contrast at 100, then the 10pts line up perfectly at 10%, 20%, 30%, etc. but if you lower contrast, it 'shifts'. with a contrast of 90, it would appear as though pt 10(which should be 100%) does not affect anything, it's essentially now lined up with somewhere around 110%. pt 9, shifts up close to 100%, pt 8 is somewhere around 90%...in the middle it gets ugly, pt 4 and pt5 seem to line up around 45% and 55% making them very difficult to dial in.
now adjusting cell light on the other hand, seems to also tie into the ABL behaviour. with a cell light of 20, you get the brightest picture the tv can handle all the time. so ABL doesn't 'kick in' until it's needed to conserve energy. when you lower cell light, you also change when ABL kicks in(lower setting kicks in sooner). it almost seems as though there are 'thresholds' with the cell light settings. like if you go from 20-17, there's very little change, and then 16 gives a noticeable drop in brightness. far as i can tell, the point where this 'threshold' change happens depends on the APL of the scene being displayed. a brighter scene will show a change at a higher setting, a dark scene may not show a change until single digits!
basically both of them cause issues along with lowering the luminance. honestly, the best way i've found to lower luminance is using the eco settings, but ONLY if it just happens to be the right amount. unfortunately only eco low is very useful imo, and i found it great for dark room viewing before i adjusted the voltages on the back panel(dropped down to around 32ftl). it acted like a 'forced' ABL, so it kept the abl 'on' permanently(or so it seemed), so not only did you get a less eye-straining image, but you didn't EVER see 'abl kick in'. at least i couldn't. but alas, after i did the voltage tweaks, eco low was too dim, and you really only have one option with little control. it either works awesome, or not at all. but on the plus side, after the voltage tweak, cell light 20, and contrast 95 got me a very comfortable 35ftl, so i didn't really need to drop cell light or contrast drastically anymore.
personally, i tend to prefer adjusting contrast between 95-100 only. if you need to go any lower than 95, start dropping the cell light. i did do a calibration with contrast at 90 and cell light at 20, but it took me about 3x as long to calibrate, and i did not find it 'looked' any better, and before doing the tedious 10pt calibrations, i'd say it looked worse than the contrast95/cell light 16 settings i had before