Table 4.

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. The minimum and maximum lamp–sun equivalences are listed

	Distance (d) from lamp (mm)
	300	250	200	150	100	50
1. From peak to peak
Min	2	3	5	9	21	83
Max	3	4	6	11	26	103
Med	2	3	5	9	21	84
2. From sunrise to sunset
Min	2	2	4	7	15	60
Max	2	3	4	7	16	62
Med	2	3	4	7	16	62
3. First band peak only
Min	15	22	34	60	134	537
Max	15	22	35	62	139	556
Med	15	22	35	62	139	555

Additionally, the medians of all 27 cities are shown