Table 1. The gray values of the corresponding image light.

T=7(ms )
E(mW/m2)	Gray scale
0.54	39
0.73	53
0.88	64
1.14	83
1.24	91
1.49	109
1.62	119
1.71	125
1.90	139
2.09	153
2.22	163
2.25	165