Well, results so far are not promising. While the Spyder3 with it's extra sensors (over, say, the Eye1 LT) has done a very nice job of helping me calibrate overall greyscale and drvs and cuts, I'm not sure it's all that great at extremely low light.
I started by wrapping it in a black shirt and putting it in a black bag. Got 00000 every time.
Next, I went to my brand new 54G10. Measured with the TV off. Again, all I get is 0.0000
OK - next I just turned on the new 54G10 with no signal. Let it warm up, let Spyder3 warm up with it. lightly touched meter when doing reads to make sure it was making full contact. When I did this, my results came in at .0018, .0018, .0011, .0018, 0, .0018, .0142, .0011, .0018, 0.000, 0.0011, 0.0018. If I kept reading, I got this same general pattern - occasional 0.00000, mostly 0.0018, occasional 0.0142.
Next, my 46G10, which I've had since about June. TV off, same results, all 00000. TV on, no signal. Occasional 0.0000. mostly 0.0024. Occasional 0.0178.
So, I don't know what to make of these numbers. I set CalMan to use the Low Light Handling features of the unit, set it to take longer reads (5 or 7 seconds,) etc. I will get, on my 46G10 for example, a string of .0024s (in continuous read mode) - then a couple of 0.0000, then .0024, then I might get a couple of 0.0178.