Table 5.

Calculated radiant exposure lamp–sun equivalences (in “days of use”) for different scenarios and for a decreasing distance d (mm) between the lamp and sunglasses

	Distance (d) from lamp (mm)
	300	250	200	150	100	50
From peak to peak
Min	2	3	5	9	19	78
Max	7	10	16	28	63	252
Med	3	4	7	12	27	107
From sunrise to sunset
Min	2	2	4	6	14	57
Max	2	3	5	9	21	84
Med	2	3	4	7	16	62
First band peak only
Min	14	21	32	57	129	516
Max	23	33	52	93	209	836
Med	16	22	35	62	139	557

The minimum and maximum lamp–sun equivalences are listed. Additionally, the medians of all 110 national capitals from northern hemisphere are shown