Number of ND filters	Distance from light output (cm)	Intensity (W/m^2)	Dose (J/cm^2)
0	10.5	20.11	0.38
0	14	10.55	0.19
1	14	4.91	0.075
2	14	2.28	0.041
3	14	1.03	0.018
4	14	0.47	0.0085
5	14	0.21	0.0038
6	14	0.094	0.00169
7	14	0.045	0.00081
8	14	0.021	0.000378
9	14	0.013	0.000234