Table 1. Luminance and blue light hazard from computer screens, laptops, tablet computers, and smartphones.

ID	Luminance, cd m−2	% of ICNIRP 104 cd m−2 rule of thumb (%)	Blue light weighted radiance, W m−2 sr−1	% of ICNIRP blue light exposure limit (%)	Hazard ratio, W lm−1
Computer monitors
1	126	1.26	0.110	0.11	8.73 × 10−4
24	71	0.71	0.054	0.05	7.61 × 10−4
Laptop screens
9	152	1.52	0.130	0.13	8.55 × 10−4
10	63	0.63	0.048	0.05	7.61 × 10−4
11	101	1.01	0.084	0.08	8.32 × 10−4
12	88	0.88	0.072	0.07	8.18 × 10−4
14	148	1.48	0.120	0.12	8.11 × 10−4
15	137	1.37	0.110	0.11	8.03 × 10−4
20	104	1.04	0.082	0.08	7.88 × 10−4
22	184	1.84	0.150	0.15	8.15 × 10−4
23	197	1.97	0.170	0.17	8.63 × 10−4
Tablet computer screens
3	175	1.75	0.150	0.15	8.57 × 10−4
4	94	0.94	0.084	0.08	8.94 × 10−4
5	63	0.63	0.053	0.05	8.41 × 10−4
6	43	0.43	0.034	0.03	7.91 × 10−4
7	142	1.42	0.131	0.13	9.23 × 10−4
17	238	2.38	0.214	0.21	8.99 × 10−4
18	140	1.40	0.120	0.12	8.57 × 10−4
19	191	1.91	0.176	0.18	9.21 × 10−4
26	203	2.03	0.180	0.18	8.87 × 10−4
Smartphone screens
2	294	2.94	0.280	0.28	9.52 × 10−4
8	178	1.78	0.150	0.15	8.43 × 10−4
13	367	3.67	0.310	0.31	8.45 × 10−4
16	409	4.09	0.380	0.38	9.29 × 10−4
25	215	2.15	0.190	0.19	8.84 × 10−4