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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

From: Equivalence between solar irradiance and solar simulators in aging tests of sunglasses

 

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

  1. Additionally, the medians of all 27 cities are shown