Table 1. Luminance values (cd/m²) for seven tablets at five different nominal brightness settings.

Values are the mean of the nine values measured across the screen for black and for white squares. Measurements were made with room lights off. Device/setting combinations for white squares which do not meet the BS 4274 requirement (≥ 120 cd/m²) are in bold, and those which do not meet the ICO requirement (≥ 80 cd/m²) are underlined.

nominal brightness setting	100%		75%		50%		25%		0%
	black	white	black	white	black	white	black	white	black	white
iPad 3	3.3	331	2.0	202	1.2	118	0.37	36	0.03	3.9
iPad 4 #1	2.8	287	1.7	178	1.1	111	0.34	33	0.02	3.6
iPad 4 #2	2.6	278	1.6	165	0.9	100	0.28	28	0.01	3.4
iPad 4 #3	2.8	300	1.7	182	1.0	106	0.30	33	0.00	3.6
iPad Air 2 #1	2.0	315	1.2	181	0.7	108	0.21	32	0.02	3.5
iPad Air 2 #2	1.8	270	1.2	179	0.7	110	0.21	32	0.02	3.3
iPad Air 2 #3	1.9	281	1.1	166	0.6	96	0.20	30	0.02	2.8