Calibrated to make the maximum LED precisely the requested value:
LED #16:	5.208000 volt (+9.54 dB) dB
LED #15:	4.268334 volt (+7.81 dB) dB
LED #14:	3.450498 volt (+5.97 dB) dB
LED #13:	2.745721 volt (+3.98 dB) dB
LED #12:	2.145284 volt (+1.84 dB) dB
LED #11:	1.640524 volt (-0.49 dB) dB
LED #10:	1.222838 volt (-3.04 dB) dB
LED #09:	0.883688 volt (-5.87 dB) dB
LED #08:	0.614604 volt (-9.02 dB) dB
LED #07:	0.407199 volt (-12.59 dB) dB
LED #06:	0.253168 volt (-16.72 dB) dB
LED #05:	0.144309 volt (-21.61 dB) dB
LED #04:	0.072530 volt (-27.58 dB) dB
LED #03:	0.029877 volt (-35.28 dB) dB
LED #02:	0.008559 volt (-46.14 dB) dB
LED #01:	0.001010 volt (-64.70 dB) dB

Calibrated to make the 0 dB LED precise:
LED #16:	5.511096 volt (+10.03 dB) dB
LED #15:	4.516743 volt (+8.31 dB) dB
LED #14:	3.651311 volt (+6.46 dB) dB
LED #13:	2.905517 volt (+4.47 dB) dB
LED #12:	2.270136 volt (+2.33 dB) dB
LED #11:	1.736000 volt (-0.00 dB) dB
LED #10:	1.294005 volt (-2.55 dB) dB
LED #09:	0.935117 volt (-5.37 dB) dB
LED #08:	0.650373 volt (-8.53 dB) dB
LED #07:	0.430897 volt (-12.10 dB) dB
LED #06:	0.267902 volt (-16.23 dB) dB
LED #05:	0.152708 volt (-21.11 dB) dB
LED #04:	0.076752 volt (-27.09 dB) dB
LED #03:	0.031616 volt (-34.79 dB) dB
LED #02:	0.009058 volt (-45.65 dB) dB
LED #01:	0.001069 volt (-64.21 dB) dB